there's to many to chose from now. a few years back you had less choice with just a few companies offering 2.0tfsi maps at the time i opted for GIAC when most were camped in revo land , american fuel stratisfing thingy jig(cant remember the technical name for it, it will kill the engine buy giac and be dammned they dont understand euro/uk engines was the forum banter. my cars file was sent to the states at the time then 5hrs later they sent the maps back i bought two pump & race couldnt tell much diff between the two, but i started to wonder about my american map but it turned out a mate sent my vagcom logs to another big tuner who looked it over and they liked the map so my concerns were unfounded.
I prefer a business where you can see before and afters where its proven results and you still have your orig map and it can be returned to normal again which seems to be missing now.