Go with whichever one you think looks better. That's what I did, and I ended up with a Pro4. Sure a lot of people look down on it as a "lower level" kit, but I would beg to differ.
A lot of people see the TC4 as a "lower level" kit also, but there is a guy at the track I (try to) race at, and it is a very nice, sleek car. As usual, you can't make a wrong choice buying a new car.
-Josh