Redwolf can be more expensive than most other airsoft stores. They are all Action brand, they come from the same factory. It's all the same. It's personal preference on looks. Some are CQB style, some are for longer barrels that are sniper style. For airsoft, length is more looks and doesn't really matter until you get into some really long barrels. The AUG is bullpup anyway so you already have a decent airsoft length barrel inside most of the gun.
I bought this one.