I shot the Muzzy 90gr 4 blades for the last 10 years and just switched over to the 100gr 3 blades this season. On all deer with the 90gr 4 blades, I had complete pass throughs and good trails. I have only had the opportunity to take one deer this year with the 100gr 3 blade, but again had a great pass through and a good trail. most of my deer have fallen within view while using my Muzzy's. In a comparison, I don't think the heads fly that much different. Both heads fly pretty close to field points although I now practice with the practice heads instead. Either way, you'll be fine whether you go 3 or 4 blade.