Well, I own the Asr-10 and cant say enough good things about it. I've never had the oppertunity to use the Asr-X, but I've heard good things about it. Well I can vouch on the Asr-10, it does everything.. Tons of effects to customize, good sequencer (Takes a while to learn) Re-Sampling <---- important. and some other good ish. . anyways, im pro asr-10 so its really up to you. I'd ask Asr- X users for feedback on the machine.