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If you need input on RaceChip the F15 fellas have been using it for almost a year with 10k+ miles on them. I've only been using mine since beg of December 2014 and so far about 4k miles. My MPG improvement is perfect, before I did not want to drive the car as hard since MPG was falling like crazy, now I'm not worried for it dropping so fast.
All the tunes you mention have plenty of feedback and users here.
I know Delnari who had BMS/DINAN and kept the aFe instead on his 235, but there's also RaceChip 235 now and some on BMS as well.
At the end of the day it will be which tune feels better for you.
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60-130 6.5s X4M
60-130 5.04s G80 M3 Stock Turbo
60-130 4.82s | 9.4@148mph 1/4 Hybrids
IG: @bmwF9XG80
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