Do you guys prefer the stock that accepts AUG or Stanags magazines?
AUG A3 stock will get you the bolt release lever which is a very nice feature to have. NATO stock you will have to run the charging handle to release the bolt during reloads. Trigger pull on the NATO stock is a little worse too because there is only one trigger bar.
I prefer the AUG stocks, the only downside is proprietary mags that cost more than AR mags. Magpul AUG mags are a good option if you don't want to spend a bunch for Steyr mags. Make sure to get some 42 round Steyr mags though. Those are my favorites and I have more of them than I do 30 rounders.