As somebody who "squandered" countless joyful hours playing both Liero and Soldat, I can say Soldat is a much more fun game with its mouse-driven controls (and right-click jetback).

I recommend playing Soldat's Capture The Flag mode with around 5 player a side. Some of the most enjoyable gaming moments. Such a great game. And free! (though later in life I registered to give back to the dev)

I haven't yet had a chance to play the recently released Soldat 2 demo yet! :)