[m141a]

They are the same, both are polymer framed striker fired guns. The 30 is a compact and the XD is a full size.

The only edge, if you even want to call it that, is that the XD has a grip safety. Other than that, as Matt stated, they are quite the same short of the size.

I own several Glocks, and an XD in 9mm. All are good dependable guns.

If you can rent either at a local range, shoot them both. See which feels better to you.