Stihl 660 Arctic vs. 390XP vs. 288XP vs. 395XP Husqvarna

IMPORTANT - PLEASE READ!!! Testing a new ms 660 Stihl for a guy in Nevada, 390XP for a guy also in Nevada, a 288XP for a guy in Idaho, and my 395XP with a big bore kit. This is pretty much the initial testing of the 660 and has carb issues as well as a slight mod that I tried but not really sure if it for the better. Standing alone, it runs pretty good. The 288 has the worst chain but still runs very well. I know the 288 would cut a little faster if the chain was in better condition and be on par with the