They all have 8 runners and a plenum, so in that sense they are all the same. The RnD that goes in to them can make them perform light years apart. For a streeter,as long as a manifold is in the ballpark, fugedabowdit. For a streeter the engine is gonna spend most of it's life sub 4000rpm. Obviously then, it should work best in that zone. If the engine has a hi-stall behind it, then that picks up the bottom. So now you need a manifold that works from around 2000 to 4000; no big deal,almost any manifold works there. But if you need to fill out either end, that's where the RnD starts to pay off.And that is where the AG really shines.
My specs are under my Avatar.