He meant Xanatos as in me! He was seconding my opinion that Daniel Defense was the way to go, not that Xanatos is a brand of railed fore ends
Personally I've only used GG&G and Daniel Defense. My first experience with the GG&G was that although once it was on my rifle it was amazing, but the hassle of wrestling that on my rifle made spending an extra $50 for the DD rails all the worthwhile.
Because of the $125 it took to actually get the GG&G rails on my gun I've yet to try another brand after the DD so I can't say either or with the Samsom and Troy, but what I can guarantee you is that you can't find anyone who wasn't satisfied with his DD rails and maybe consider the best rails you can get (unless you specifically need the features of the A.R.M.S. #56 or something like that).