Hi
Drift Master, don't personally have experience with either but hoping the following helps:
Source1064 posted that they had the Racechip GTS Black installed among other very nice mods, maybe contact them and see if they can give you any info?
The post I am referring to is here:
Racechip GTS Black on G series 7
Just in case you haven't seen the Dinan thread, there is one here, not sure about end user comments / reports but maybe they can provide some reference for you...
Dinan Stage 1 thread (company is OP)
Hope this info helps. Safe travels (or wild drifts as the case may be!)
