I'm a big believer in the ability to get parts in case they're needed, and at a decent price. That's my beef with brands like Mahindra and Kioti. Now, having said that, I've never owned an "off-brand" and am only going by what I've heard people who have owned them say. I think a lot depends on how much you use a tractor, because if you use one almost every day, dependability should be at top of the list. Whereas, if you just use one every now and then, maybe you could by with a little less. One thing about the smaller tractors that I've found is that they lack the traction that a bigger tractor has, and that's because they weigh less. That might not matter in mowing, but when it comes to something like using a frontend loader, it will make a big difference.
