Ive used both the 14 and 15 fronts, the 14 was great ,i put the 15 on and the very same tight trails/mud/ruts etc were more difficult and i stalled 3 times ,the 15 doesnt pull as easily off bottom ,put the 14 back on were good

if your trails are open then the 15 may be better it gives far more top end which i dont use