Currently, I use 771's, 773's and CRs. My XD rig has CR's, mainly because I had some laying around that I used for other rigs, been using a Glock lately and I'm cheap. I prefer the 771's with 773's in a close second.
As far as I can tell, most manufacturers design their pouches for bullets forward. I don't think I've ever see anyone using the bullet rearward method, but then, we do what works.