Err.. A SAFC can be better than any of them if the tuners cannot tune your car... or doesnt dare to push the limits...

Personally, since i have this tendency to learn the ropes and tune by own, i would go for the Autronics because the instructions are in English.

These boxes all control the same variables... some have more options for other needs (e.g. Antilag for rally/race purposes) but these add cost to it... think the most important thing u need to think about IS the ability of the tuner to guarantee his/her work and his experience with the 4G63 engines and its mods...

 

This is more opinion than fact.
My personal preference is AEM then Motec.
AEMs' new software is fantastic. Very user freindly. About 30 minutes road tuning, a good dyno day for a torque adjustment thru ignition and you are in heaven. Not that Motec can't do the same. It will depend on the tuner and whether or not the customer would like to spend twice the money.