My wife has the 3.5-15x56 on her RRA with a MOA ret (I believe it's the NP-R1) and I have the F1 on my Gap with the MOA reticle. I personally think the glass is slightly better on the F1. The reticle in hers is a bit fine for my 50 year old eyes, but you're getting a different ret, so that portion doesn't apply to your question. If the F1 would have been available when we put her rig together I would have gladly spent the money and opted for the F1. That's just my opinion, and I'm wrong alot.