Look at centrafuse GUI everything is streamlined, a tablet you have apps and such you have to go through and find, centrafuse has a simple gui large buttons and is geared more toward car use. Lets see right off the top of my head I can have higher quality audio outputs rather than a sad headphone jack, Data log ODB with adjustments on the fly, pop in a flash drive with music, have multiple cams hooked up recording for races and such or just for security, HD radio or satellite radio if I wanted. That is without even trying.... My PC boots up in around 6 seconds which is faster than most tablets. So whatcha got now?
A tablet might work for some, I toyed around with the idea, but I would rather be able to use something much more customizable and upgradeable than a tablet. So if it works for you that is great, I wish for more to get into the car pc thing. I just like people knowing all that is possible