So far, I'm enjoying Torchlight 2. As Dave said, it's very polished, and there's a lot of fun to be had. On the other hand, I feel like both games (D3 and T2) are equally polished, but I found the combat much more satisfying in Diablo 3. The loot system is more interesting in Torch 2, but again, the basic "click this guy, watch him explode" is better, I think, in Diablo 3. Part of that cames from Torch 2's approach-- Diablo 3 was trying to "change things," where as Torch 2 wants to just refine what already exists. There's room for both games, but in all honesty, in a month I doubt I'll be playing either of them.
I will be playing BORDERLANDS.