Fusion
My feeling is that everybody has their own needs. My need is that I move around a lot taking a my Macbook Air around the office. I just close the lid without closing Parallels. But this has caused Parallels to crash (kernel panic). So Parallels does not satisfy my need.
I have used Fusion for 3 days. It is very stable, uses less resources and most importantly, it does not crash when I close and reopen the Macbook Air lid. Fusion does all the things that Parallels does for me. There are certain things that Fusion is inferior like file sharing (in Fusion it is manual but it is automatic in Parallels) but I can put up with Fusion because it does not crash and therefore satisfy my need. You may have a different need and therefore will choose the one that fits you. For me at the moment, Fusion is the answer. I am happy now.🙂