How much do they matter? Oversize, midsize, taper, softness, stickiness, etc.
I personally like the Winn Dri-Tacs, but my driver and woods have Golf Pride grips that they came with and I like them because I can position my hands in the exact same spot every time based on where my lower thumb is with the lettering.
I don't have big hands, but have hit some clubs with mid sized grips and liked the results.