The tubes performance wise are the same just the commercial has a little bigger circumference. Springs and buffers depend on gas system and caliber. I like the spikes H2 buffer for 223, but the regular carbine buffers run fine on 16" barreled 223's when you get into SBR's and pistols that's when you might have to toy with the gas system and buffer system. Most springs are all the same, some claim lighter and silent operation, but the regular springs work fine.
If you're talking about LR308/AR10 systems it's a whole other can of worms.