Artistically i'd put Trine 2 several planets ahead of DKC, but graphically it's a bit harder to judge. As Jizz_Beard (lol) said, Trine 2 is relatively slow paced, where as DKC is fast and has constantly moving assets in both the foreground and background, which naturally results in a lower amount of detail per area.

Personally i'd say Trine 2 looks better despite the faster pace of DKC, but i could understand someone disagreeing.