Our team has tried multiple different controls and in the end it comes down to driver preference, if you haven't already decided some new driver candidates I'd check out this article
https://frcdesigns.com/2016/01/08/ke...vis-covington/
I would definitely recommend trying out different control systems and see which type your driver prefers, it's would also be a good chance to get some more programing experience. We have used tank (left joystick controls left, right controls right), arcade (one joystick controls the whole drive train), and a power throttle (one joystick controls direction, the other controls speed).
Our 2014 driver was amazing with tank and 2 of the Logitech extreme joysticks, our current driver prefers arcade since he got lots of practice with it last year, and we had a offseason robot between 2014-2015 with power throttle and that thing was so much fun to drive but it's not something anyone can pickup and do. Here's the thread about that offseason robot:
http://www.chiefdelphi.com/forums/sh...d.php?t=131060