Everyone is talking about how a steering wheel gives you super highly accurate precision movement. I only want to point out that, this is FRC, we aren't picking up 1 inch diameter objects, with a tiny 1inch claw. You don't need insane precision. And besides, if properly used right an Xbox controller gives you the exact same amount of precision.
But the final decision should be your driver's. And whatever he/she chooses, they definitely need to practice a lot with it. (I personally practice a lot with my Xbox controller by playing a ton of rocket league
).