The Oceania Defence ones get a very good review for use with AR's over on sportshooter, and their 556 Samson is designed specifically to work with a Samson rail. One related question is how are you intending to manage gas blowback? If you aren't running an adjustable gas block, the Oceania Defence one claims to have very little blowback due to chamber design.
Speaking from experience, blowback is a pain in the arse if you are running a carbine length system that is already fairly over-gassed as it is.
I don't know much about the MAE, but they are pretty heavy! (490gr for MAE LEM CMP vs 172 gr for ODL Samson)
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