R-Tech will give you a map tailored EXACTLY to your hardware and the condition of your engine. It's a more personal service and is typically more exiting watching Niki undertake a health check and several dyno runs while he perfects the tuning of your car than a man upload a map from a laptop, do a bit of logging and send you on your way.
Aftercare with R-Tech is second to none, he will always help you out if you have any problems.
It's substantially cheaper than Revo too as he doesn't have the overhead costs that big businesses have.
Have a look in the Revo & R-Tech sections on the forum to help make your mind up