they all have 20mm pins apart from the AUQ (19mm). I found this out the hard way when I went to install BAM pistons into my AUQ lump and ended up having to buy new con rods to fit. great excuse to get forged ones though
The AGU lump has the larger valves yes. This only becomes beneficial at 300bhp+. Before that the small valve heads actually produce better results. I could go into why this is, but I'll save it for a talk around a BBQ sat in a field
There are people saying the AGU has a forged crank rather than a cast one. I've never heard of anyone snapping a crank...
As with all the k03 (and sport) turbo'd engines you'll only get 210bhp from them regardless of your special intakes or miltek exhausts. The NBDW engines will get better results than the DBW ones that's a fact.
personally if you have the intention of doing more than an air filter and exhaust buy a NDBW 150 lump.