Heck, there are so many you can't even just say Red, Blue, Green, or Orange without hitting at least 3 major brands with each color!
The good thing is, is that there are very few bad brands these days. Except for a very few specific brands, and a few specific series within a few other major brands, even the worst tractors of the last 15-20 years have excellent reputations.
I'd enjoy a Saturday of going tire kicking on tractors.