How to put it - I think, epsom looks somewhat "flat" compared to courchevel, which has more "colour-depth"? The colour in courchevel is deeper (more concentrated) in the middle of each grain, almost like a dot... (Don't know if it makes any sense? I'll try to take pics tomorrow of both in the same colour.)
I prefere courchevel much more, it's TDF in bright, saturated colours - red, green, yellow - esp. for small accessories, where you don't get much corner-wear.
(just a small thing, I see it often on ebay too: it's Courchev
el, with E - like the place in the French Alps, has nothing to do with 'cheval'
)