the problem here is your responses will be from A, a REVO fanboy or B, an APR fanboy.
Im not a REVIO fanboy that s for sure. Theres no doubting their performance is always amongst the top two contenders on every car they map, but im just not a fan.
As for APR having a few guys with problems with their map...i reckon for every internet post about a 1.4TSIissue with APR, i could find at least 2 for the REVO 1.4TSI. But thats not the point. The issue is these engines are temperamental. You either have a good one or a bad one its pot luck.
If your going to choose between them i think you need to consider your future options. If you go REVO you are stuck at stage 2 at the most because they will not entertaion any ffuture stages of tune. That said Hurdy runs his stage 2 REVO GTI with a LOBA Hybrid turbo and still makes good power so that is of course an option. REVO has a semi switchable map system(at a surcharge of an additional £99) which allows you to change the settings of the map to different octane maps and a stock performance emulating map.
If you go APR, then you are future proofed on the tuning front. APR currently have 3 1.4TSIs in 3 different countries having stage 3 maps developed for them(mine is one of them). So APR are taking their Research and Development alot further than the other tuners who have given up at the first hurdle. Plus APR load multiple maps onto your ECU including the 100% OEM stock map which you can switch between via the cruise control map and its included in the cost.
FWIW i have had a few maps on my car. Shark performance stage 2, Jabbasport stage 2, APR stage 2 and APR stage 3 BETA test file. Review of my Shark v jabba setup here:
http://www.vagoc.co.uk/vb/showthread.php?t=10352
tbh figures wise stage 1 & 2 maps for both companies will be neigh on identical, as will performance. They differ in power delivery, in that REVO feel very strong low down, whereas APR have a more progressive delivery, but thats down to personnal preference really.
Im keen to see what my car will be once the stage3 map is complete. I reckon about 270hp is a nice target althoguh they saty thats to easy to get!!