All these 'brand names' are made up bollocks when it comes to these sorts of products. Smoke screens that'll vanish in short order. Generally not even representative of the product because the re-brander will take products from dozens of different chinese factories and slap it in their own packaging - like Nuprol.
IMHO, investing in KeyMod at this point is a really bad move because M-LOK won the format wars and you're investing in obsolete designs. Any rail in that price range will be of worse quality than the one you have on the gun already most likely, a downgrade, so you'd be better spending nothing and keeping what you've got. Also you'll need a good set of tools and experience in taking ARs apart/putting them back together to install a free float, plus of course you need to make sure you find a low pro gas block that'll actually work with your outer barrel (unless you just don't want the faux gas system which is fine but if you're making the change for looks seems counter productive).