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According to me it is hard to answer this question. Eldar Army is so versatile and contains alot of great unit so all type of army could work really well depending on the player's play style.
If you want a tough army, with low range and quit good fire power go for wraith.
If you want mobility and hard hitting unit, go for Jetbike army with skimmers.
If you want a specialized team that can handle pretty much any situation take an elite base army.
If you want a plenty of shots to fight swarms or medium infantry heavy team go for a foot slogging army.
So, according to your play style you will chose one of these and it will be the best that suits you.
Well, assuming "skimmer" includes a mechanized infantry army, then I think that is often considered the most competitive. Generally these types of armies will include lots of a elite units as well, for a greater amount of punch in a smaller unit size (to be able to fit in a transport).
These armies can outmaneuver almost any other army in the game, and can still bring the full force of eldar elites to bear where you want them.