Marlin or sprinter, which is better?
Considering Marlin is based on Sprinter, and it has much more active development and and supports more hardware, I’d go with Marlin. I have used Marlin in the past, but currently using Repetier along with Repetier-Host.
All I can say: “Friends don’t let friends use Sprinter”
I am using Sprinter with Prusa i3 without any problems or limitations , for new Rebel will use Marlin due to better LCD support.