If it is for racing, then get the Epic.
If it will be a bike to supplement your racing with some good ol' fashion bashing in the woods, then the Stumpjumper may be your bike.
I assume by the way you own a carbon hardtail, you'll be racing this bike, or riding it like a race bike, so I would have to suggest the Epic. I've taken a test bike through some serious punishment (drops, jumps, rock gardens) and it always rode great. You won't loose the way you ride a bike just because you ride a different kind of bike, so you should probably get one that suits your style. And my guess is that bike is the Epic.
But I'll tell you the same thing I tell everyone; go ride them. It's the only way you'll actually know. Doesn't stop me from asking the same sorts of questions though. You never know, you may really like the way the SJ descends and put up with it on the uphills, I know I prefer the SJ for general riding.
If it will be a bike to supplement your racing with some good ol' fashion bashing in the woods, then the Stumpjumper may be your bike.
I assume by the way you own a carbon hardtail, you'll be racing this bike, or riding it like a race bike, so I would have to suggest the Epic. I've taken a test bike through some serious punishment (drops, jumps, rock gardens) and it always rode great. You won't loose the way you ride a bike just because you ride a different kind of bike, so you should probably get one that suits your style. And my guess is that bike is the Epic.
But I'll tell you the same thing I tell everyone; go ride them. It's the only way you'll actually know. Doesn't stop me from asking the same sorts of questions though. You never know, you may really like the way the SJ descends and put up with it on the uphills, I know I prefer the SJ for general riding.