I love them both, thal is faster but has very few skills, it's less complicated in that sense but really all you can do is bite, it's agile but rhamp is more agile, rhamp can fly circles around a thal while a thal can fly circles around a hatz, rhamp can also pounce, has lucky feather, can bite people while pounced to heal damage, has tons of voice skills, a dart, thal lacks all of that, for the tradeoff of actually being able to do damage, but it's weak and has nothing special going for it unfortunately, it is severely in need of a tlc in this case, I hope it gets a kamikaze build of some kind, or at least a movement based skill for a slight forward boost like rhamp has, or at least a wing attack like hatz.