I own both of these tripod heads to use to support my Swarovski 65 spotting scope. I previously posted my dissatisfaction with the Gitzo and I tried the Velbon based on some comments in another thread. Here is my take since I own both and can compare them directly:
Gitzo: I was unhappy with this head because it only pans and tilts smoothly at low drag settings. You have to tighten and loosen both pan and tilt every time you carry the scope for it to hold the scope from flopping around. If you set the drag high enough to hold the scope while carrying the tripod, it is too jerky when pointing the scope and shows a slight rebound when you let go. In addition, the drag is cumbersome to set and there is no lock. You set the drag by turning knobs on the side of the head. It takes several turns of both to loosen and tighten them each time you set up to use the scope. The only thing I really liked about this head, other than its weight, is that at the low drag settings, it pans and tilts effortlessly with a very silky movement. It also feels extremely well made and has a very solid quick release plate (much better than the Bogen's I have used). Still I was disappointed that it really seems suited to only very light loads and is not really suitable for even a small spotting scope unless you want to fiddle with the knobs every time you carry the scope from one spot to another. I was going to live with these limitations because I need a lightweight head until I heard about the new Velbon.
Velbon: For almost half the price, this is a MUCH better head for use with spotting scopes, at least with my 65. It is much more stable. I did not really notice a problem with the scope settling when I used the Gitzo, but the Velbon is so much faster (it settles in maybe a third of the time), I was pleasantly startled by it. A very solid, sturdy head with the load I have on it and this does really help the view. In addition, the drag settings are much better. Adjusting the pan is set and forget. I found a setting that allows smooth panning with little movement when the scope is carried. Tilt is almost as good. However, here I found the setting needed to allow the scope to be carried was maybe just a little higher than I like for pointing the scope. However, the tilt drag is very easy to adjust and requires just a very small movement of a lever to go to a lighter setting. Thus, the scope can be used at the higher drag settings necessary to carry it, but when settling down for extended scanning, I do like to tweak the tilt setting a little lower. Again, this is easy to do. In addition, there is no rebound after pointing the scope at a new target. At lower drag settings, the head is not quite as silky as the Gitzo but I think this would only be important to someone shooting video. In practice, the advantages of the Velbon greatly outweigh anything the Gitzo does. The Velbon comes with a quick release plate that is as solid as the Gitzo and a long plate is standard so it was easy to balance my scope. My only complaint about the head is that there is no quick release plate with a 3/8 inch screw so I have to use the adapter to mount my Swarovski. I prefer the security of the larger screw.
Overall it should be obvious I think the Velbon is a great head and is way better than the Gitzo. At only 1.3 lbs it is a great alternative for those looking for a high performance, light weight head.
Gitzo: I was unhappy with this head because it only pans and tilts smoothly at low drag settings. You have to tighten and loosen both pan and tilt every time you carry the scope for it to hold the scope from flopping around. If you set the drag high enough to hold the scope while carrying the tripod, it is too jerky when pointing the scope and shows a slight rebound when you let go. In addition, the drag is cumbersome to set and there is no lock. You set the drag by turning knobs on the side of the head. It takes several turns of both to loosen and tighten them each time you set up to use the scope. The only thing I really liked about this head, other than its weight, is that at the low drag settings, it pans and tilts effortlessly with a very silky movement. It also feels extremely well made and has a very solid quick release plate (much better than the Bogen's I have used). Still I was disappointed that it really seems suited to only very light loads and is not really suitable for even a small spotting scope unless you want to fiddle with the knobs every time you carry the scope from one spot to another. I was going to live with these limitations because I need a lightweight head until I heard about the new Velbon.
Velbon: For almost half the price, this is a MUCH better head for use with spotting scopes, at least with my 65. It is much more stable. I did not really notice a problem with the scope settling when I used the Gitzo, but the Velbon is so much faster (it settles in maybe a third of the time), I was pleasantly startled by it. A very solid, sturdy head with the load I have on it and this does really help the view. In addition, the drag settings are much better. Adjusting the pan is set and forget. I found a setting that allows smooth panning with little movement when the scope is carried. Tilt is almost as good. However, here I found the setting needed to allow the scope to be carried was maybe just a little higher than I like for pointing the scope. However, the tilt drag is very easy to adjust and requires just a very small movement of a lever to go to a lighter setting. Thus, the scope can be used at the higher drag settings necessary to carry it, but when settling down for extended scanning, I do like to tweak the tilt setting a little lower. Again, this is easy to do. In addition, there is no rebound after pointing the scope at a new target. At lower drag settings, the head is not quite as silky as the Gitzo but I think this would only be important to someone shooting video. In practice, the advantages of the Velbon greatly outweigh anything the Gitzo does. The Velbon comes with a quick release plate that is as solid as the Gitzo and a long plate is standard so it was easy to balance my scope. My only complaint about the head is that there is no quick release plate with a 3/8 inch screw so I have to use the adapter to mount my Swarovski. I prefer the security of the larger screw.
Overall it should be obvious I think the Velbon is a great head and is way better than the Gitzo. At only 1.3 lbs it is a great alternative for those looking for a high performance, light weight head.