Depends on your intended use, size of hands and other personal criteria that are unique to you. Suggest you try out a variety of XDs at a range or gun shop.
Nice choice and welcome to the forum.I'm psyched to get an XDm9 Compact! That would be as close to perfect as I could get with any gun! It's gonna do alternate nightstand duty with a Beretta 92fs and a Springfield Lightweight Operator 1911. The XDm will of course be my EDC gun! Throw in a S&W 442 and I'll be all set!