20 years ago I would have said one hander it looks cooler. Today two hands seems the better way to go since the players are taller so reach is not a problem, and faster to get the two hander ready and be in position. The one hander is still the better shot to hit on the run out of position than the two hander. Serve returns the two hander is better but I like the one hander on mid court balls with no pace.
NSCA, CSCS, NASM. PES, CES