For a gun that small, you'll be giving up the pocket carry concealability since pocket gun bulges are perceived more as a random object than a gun, and you'll also be giving up the ability to inconspicuously grip your gun to have it ready if you ever feel the need.
Not that you might not have a use for it where it's your best option, but at least for me, in the majority of circumstances, if I'm going to be IWBing I'd rather have a larger gun since either will cause me to have to wear a baggy cover garment to maintain concealment, especially if I'll be moving around, whereas the pocket holster will generally offer ideal concealment in a more broad spectrum of uses.