peobey,

Try the blog of our resident stove expert, HikinJim - adventuresinstoving.blogspot.com

His information is some of the best I have seen. He suggests that there are advantages and disadvantages to each. The biggest question many have about the MSR is the effect of cold on the plastic pumps. Although I have no direct experience with either, I have used an MSR XGK which has a similar (but not identical) pump. It has worked well to at least -40 (same temp on both scales). The older XGK will work on most anything (and I have tried quite a few including several jet fuels) it is quite simple and that helps. It does not simmer well however.

Respectfully,

Jerry