Well we have omse of both and also some cheap Target track. I think the Brio and Thomas quality are about equal. I like that the Brio stuff is less commercialized, but DD actually really does love the Thomas trains more.
There has been a fair amount of discussion about train tables in the Around the House forum lately:
There tend to 2 very divergent opinions on train tables, LOL. We have one, but we don't use it very often for trains.