[Gurthang]

Still, Thinlómien has a point there. The Elves in Aman had no worries about attack or betrayal, so they could concentrate on building beautiful wonders or mastering arts and song. On the other hand, the Noldor in Middle-Earth would have spent much more time studying warfare and the use of arms rather than concentrating on making less useful but more spectacular things.

With that in mind, I would say that the Elves of Aman were better at building beauty, singing, art, and understanding of animals/plants. The Elves of Middle-Earth would have had much superior knowledge of building strength, warfare, smithery, and negotiating. I would think that things such as mining, hunting, and writing would have been similar in both places.