TO and TX are different game, don't come play TO and expect the same. TX had lot of learning from TO and could star on a different gameplay foundation, while TO is blocked by its legacy (you can add new stuff or slightly modify existing feature).
The tank are definitely light, it take ages for a hornet to get track on the ground.
Main difference is indeed the graphic. TO is less details, less fancy, ... main reason is to have it playable on potato powered pc. So no fancy exhausts flame or crystal armour, but we do starting to have mechanical moving parts.