SD!
I chose the SD. Easier to maintain, all parts are available at my LHS. Is it fast? sure it is, but it all depends on the other factors such as ESC, setup, driver, etc!
I originally wanted an Evo 3 SE but, my local shop/track didn't always have the spare parts, and since I am new to racing, I knew I would break parts.
Yeah, I have heard "Brokomo" and "Slowkamo" yada yada yada. Yes, I break arms! Alot of them! But, that wasn't due to the car running at speed and then arms would just break, no I was still learning to drive, setup the car, etc and yes, I would run into the boards alot so I broke alot of arms.
Now, that I have a few races under my belt, the experience I have gain has allowed me to minimize breakage. Remember, I am still new to this and I am still learning.
So, to wrap up, Go for the SD if your local track/shop have all the parts for it. The Evo 3 is a great car but, for me it wasn't going to work if I had to wait weeks for spare parts to be special ordered.