I wouldn't go with 'favorite' just because I work with whatever I have, and have been through lots of different cameras over the decades from different manufacturers and different body types and sensors.
My current system is a Sony APS-C sensor E-mount mirrorless body, A6300, paired with the FE100-400mm GM lens and optional 1.4x teleconverter, along with a backup lens for occasional use, Tamron 150-600mm. Up to 1 1/2 years ago, I was using two systems - a DSLR and the mirrorless, but decided to switch over to the mirrorless full time as it was just faster, more capable, better IQ, and smaller & lighter to boot.
If another manufacturer came along with a camera that worked better for me, in the right price range, with ergonomics that I liked, I wouldn't have any issues switching brands. Right now, and for the past few years, the Sony bodies have meshed best for me.