Tribalwars 2 adds loading screens, wtf. like RK they think everybody wants pretty laggy graphics.
Luckily they didnt force it on us and made a new game.
There also seemed to be more premium features p2wish in Tribalwars 2, though they do have some of them in every other world on tw1 now. This one won't have any premium extra premium things though, only the subscription account which I usually pay for when Im playing. It doesn't give you any extra resource or troop benefits, just a more menus, a quick bookmark bar, and features to make it easier to manage multiple villages.
Tribalwars also lets you use (some) scripts (javascript) for some things, there are a lot of cool player made scripts, I think most of them revolve around farming, which doesn't matter here.
Mostly though its probably just that I've been playing Tribalwars 1 on and off for 8 years as of a couple days ago (I got a notification) and resistant to change.