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Slx all the way, comparatively cheaper and smoother shifts although they both excellent in their own right. My experience is that the GX began to shift clunky over time despite numerous attempts to retune. Could have been a lemon as there is a well documented issue on some, where I developed a noise on the 5th sprocket. I have an XT cassette now and can hardly tell the difference so the SLX to me represents the best value. Hope this helps.

Hey Jacques, I am fortunate enough to own both bikes and can without a doubt say that the epic evo punches above its weight so not a typical XC rig, not by a long shot. It’s a very fast, capable lightweight climber and equally up to the task on the more rough stuff and I’m finding hard to part with it since I got the stumpy. The stumpy evo is hardly a slouch up hill but loses some traction up hill compared to the epic naturally so for longer rides I’m finding myself on the epic. Depending on how steep and rough terrain is the stumpy is ofcourse more stable, planted and capable on the downhill stuff but at some cost to carry the extra weight. The stumpy is more geared for enduro so my bet would be on the epic evo as a great all rounder.