BAM is no better than the AUM hardware wise.
Yes is has a k04 and can map to 265-270bhp with the right mapping....however, if your really into your VW's you will see that the BAM has 19mm grudgen pins, a lower CR, small port head etc.
AGU is the one to go for. 20mm pins, Large port head etc. You need to combine the 2 if you want a good conversion. BAM Management is the same as AUM....so no worries there. Wideband is brilliant...same with exhaust gas probes to keep a eye on things instead of ECU models.
AGU hardware, Me7.5 management, exhaust probes, wideband is where its at tuning a 1.8T combined with a strong good flowing engine and power can be on tap