Arcade wheels are probably easier to mount, but you'll have to interface it, and perhaps clean up / restore if you get one second hand - have a look on ebay

Also note that PC wheels are always ~270 degree ones, whereas arcade games used 270 and 360 degree (spinner type) wheels. Depending which driving games you prefer you should get the appropriate type (or both): 270deg wheel for OutRun, Chase HQ etc., 360deg wheel for Super Spring, APB etc.