Most of the AR15s are forged lowers & I was told at one time that there was only three forging companies in the US that made these. And that the all made the same quality forgings according to mil specs. So It the quality would depend on the machining company & they have to cut the lowers to military specifications. So some may be just slightly better fit but they will all should function because of the Mil Spec.
So as far as being a snob because you paid $$$ more dollars than the guy that just bought the best gun he could afford, you could be snobbing for the wrong reason. It's what goes on your lowers that makes the rifle or pistol worth the dollars not what brand it is.
Like the RF85 nano-technology treatment that Anderson puts on their parts to make a lube free rifle brings their products up a few notches.