One is Fleet Of Foot, which is not a Warlock-exclusive ability. Both have high-damage weapon upgrades, both are meant to be used in a heavily offensive strategy, and both can defend themselves with shield bubbles. The Force Commander and the Warlock are similar is many ways.
The Warlock is the Force Commander’s thinner brother who, due to some kind of social anxiety problem, always wears a mask. If that sounds like a good time to you, then read on. If you plan on playing the Eldar, then expect to spend a lot of time learning about the units and their special abilities. The Warlock is the only one that is great in toe-to-toe combat, but even he is best when the player pays attention to his many devastating abilities. The Eldar commanders reflect this perfectly.
Playing them requires constant attention to many different units, and their most effective strategies tend to revolve more around tactics than long-term battle plans. It’s no secret that the Eldar are a micro-management intensive race.