Premier is the best glass I've used, which includes SB, March, Kahles and others. I didn't spend much time with the Hensoldt, but the Henny wasn't noticeably better. As mentioned though, glass is subjective.
I had a PRH 3-15 with the mildot. While I liked the scope, it was big and bulky for a 3-15. If I'm going to deal with a big/heavy scope, I'll just tack on another inch of length and go with a 5-25 instead, as the 15-25 range is a lot more useful to me than the 3-5 range. Just my opinion.
As for reticles, I haven't used a PRH 3-15 with the G2XR, but the G2MD reticle was very nicely sized.
Strangely, I actually prefer the G2MD over the G2XR in the PRH 5-25 for most purposes, also. The G2XR in the 5-25 is extremely fine, and is almost unusable under ~8X or so. It is way too small for barricade shooting for that reason.