A few perks of the XDm, over the XD..
- High-cap mags, natively, on the XDm (19 rounds, vs. 16 rounds in the XD)
- minor conveniences (you don't have to pull the trigger to field strip the XDm)
Also considerations...
- Mags are not compatible.
- while the XDs are still being made, they *are* being phased out. the XDm is the direction they're going, across the board.
*shrug* Personal choice, really. With the XDm, the extra coin is in my opinion worth it.. For what it's worth, I had an XD 5" tactical, and sold it as a part of my current set of toys... 2 x XDm 4.5" and an XDm 3.8" compact.
D.