I have kept both the lemonpeel and the coral beauty. At the time, when I had the lemonpeel, I didn't have much coral at all. But she nipped at all my live rock, and anything else with algea on it. So I started feeding her some dried seaweed on a clip and she cut down on the nipping. She was really pretty and I enjoyed having her, but I lost her to ich. I wouldn't mind having another, but I have the coral beauty right now, and I've heard you shouldn't mix their genera. I would definetly suggest getting a coral beauty though, they are also very pretty and the one I have now hardly ever nips at anything but my glass. They like slimey algae.
If you just want the lemonpeel for the bright yellow color, I would just consider getting some yellow tangs. That's what I did.