I went with the 10.0 DDM4 for my 11.5" build. I have had a lot of different forearms over the years from a number of different companies. DD has been my favorite for a while but damn, they really nailed it with the DDM4/Lite Rail III version! I absolutely love it and IMO, It's just about the perfect rail. Light, thin, solid, built in sling mounts, easy to install, etc. My only complaints are the cost and I wish DD would release some other lengths such as a 9.5" (for 10.3/10/5" builds) and a 10.75 for 11.5" builds.
The KMR by all accounts is a great forearm too but I don't like the keymod system. Just can't get past a bunch of little penis looking cutouts all over the place
if BCM ever gets over it and produces an MLOK version, then I'd love to try one. I do like MLOK forearms but every one I've looked at has at least 1 or more shortcomings. The closest version to perfect IMO is the KAC URX 4 but the problem with that one is due to the way it mounts, pinned on gas blocks are not an option and I personally only trust pinned on gas blocks.
Here's a shitty cell phone pic of mine...