As long as there are different brands, different blends, different percentages within those blends and brands there are going to be many differing opinions as to which is best. I use Fox 5% nitro with 20%-50/50 lube in all my two strokes and WildCat 10% Premium and WildCat 15% Premium Extra in my Saitos and Enyas depending on the compression and WildCat ProMix 20% nitro in my YS's, the ProMix has a couple of percentage points of castor in it. These are my choices because they work very well. I do not use any fuel without castor. A couple of my Saitos and one of my Enya's are 13 years old.