Acrylic, every time.
Calgel doesn't suit everyone in my experience, and sometimes peels off.
Acrylic is so versatile and allows you to build up odd shapes, sculpt if you like, much easier with repairs also.
I speak from experience when I say I learnt gel first and was turning lots of clients away who phoned asking for acrylic and weren't prepared to give gel a go. And it's by far and away the most popular service I offer.
So learn acrylic, that would be my advice. x