Ok I have been to both Hills & UAS for tuning and Unigroup for Dyno runs.
Here are the facts - these are what I have seen with my own eyes - And please keep in mind that I didn't know shite back 12-18 months ago.....
Hills tune:
Car on Dyno. Tuner in car with laptop. Friend of tuners listening in engine bay (ie using his ear under the bonnet) Hand signals for yes pinging, or no OK.. No Dyno print out, not AFR. No timing light.
We all know what happened after my last tune there.
UAS Tune:
Multiple AFR meters hooked up - Knock earphones, Boost and AFR dialed into Dyno - Printed Dyno graph at the conclusion. Timing lights and many other safety precautions taken - Biggest fan eva at the front of car !
Unigroup dials in AFR and boost - and seem very competant - but never tuned there.
Ben at UAS is really good with the Microtech and good with PFC - He will tune other's too, but may take more time - just to be carefull - But with UAS - You do not pay for their learning and always take much care. So good for them and good for you !
Up to you - Unigroup are very good with Apexi - and I would take my car there to tune.
I also know where I WOULD NOT take my car again. Nuff said.
I hope my real life experiences help.
Cheers,