From what I've read, some of the new theory behind frozen being better is related to inflammation. The stims for the fresh cycle can put a lot of stress on the body and create inflammation and other unfavourable conditions. I'm not saying that means every fresh cycle is doomed to failure (far from it - our DD is from a fresh cycle), but for those women who are more sensitive to those effects it could make a big difference doing the frozen cycle.

That said, you also need to consider how many embryos you have and thaw rates for the freezing process to be used (vitrification has the best thaw rates). We've never had many embryos (last time we only had 2), so freezing would be a big gamble for us.
It's interesting you say this because my new protocol is designed to reduce the effects of inflammation and the immune system. I wonder what they do for FETs???