I agree with all of these comments, but don't let that talk you out of an S. That "tad" longer on the XP is nearly a foot and does make a lot of difference on tight trails. I took my S out last weekend and some of the places I went would have been a real challenge in an XP. Not saying it wouldn't have made it, but I would have been rubbing a lot more where the S snaked through the trees. Full lock left, then full lock right, then back full left again. Also some of the trails I was running on my sidewalls on both sides, the XP would have been catching tree roots. I've also heard a lot of people having issues with the rear control arms catching on rocks and such. If you ride tight trails and aren't planning on high speed or jumps, the S might be right up your alley. Bang for the buck is definitely in the XP overall, but not if it doesn't fit your riding style. For me, the S is perfect, but i'm sure as trails widen up over time, the XP may be better. I think it all depends on your riding style and trails you prefer. The deciding factor for me was that the XP was too long to fit on my truck where the S fits perfectly eliminating the need for a trailer.