I like the palmas pollis cuz some get an awesome green coloration! Aside from that, the dels look cooler than the sens, but cost five times as much and not much difference imo.
I have 3 babies in my tank. I started with a senegal, then I HAD to get an endli, and today I got an ornate. Get all of them, they're so much fun! I can't wait until mine are bigger!