I have owned most of those (YHM LaRue and Midwest)

the YHM rails are really nice, super solid, won't move and are of good quality. You aren't going to get as good of a finish, the barrel nut is made of what I feel to be cheaper aluminum and the color is not a nice deep black finish.

The Midwest rails I had had were 2 piece free float. the color is excellent, they clamped onto the existing barrel nut which has the potential to be able to slightly move under rougher conditions and a ton of rounds fired.
very nice T-marks on those and I haven't had any problems with accessories not going on the rails. I had an issue and MI sent me a new one no questions asked so they have a good warranty and customer service backing them up.

The LaRue is IMO the crown jewel and is now exclusively what I have on my ARs....all of them. Superior quality, the barrel nut is extremely strong, the system used makes sure it will not move at all, all accessories go on to the rails really nice, great quality black finish, excellent T-marks, lifetime warranty and of course "Live free or die" is laser etched on it which adds to the extremely cool factor. The price is definitely up there but you won't have to buy another rail again, the value of your gun goes up when you put "larue" next to it and you are going to have a extremely fine looking weapon.


call me a "larue fanboy" I guess but after all the ARs and products I have seen and played with, his quality is top notch and IMO can not be beat.