I think a lot of people think the FH volley is easier than it is. FH volley can be tricky because folks often use the wrong grip, often backswing, often hit spreadeagle to the net.
1HBH volley has the advantage of almost requiring a shoulder turn.
How anyone hits a consistent sliced 2HBH volley when deep in the court or the ball is lower than the net is beyond me.
-- Random Error Generator, Version 4.0
-- Master Moonballer