I can tell you this much: LPCM is much better than Dolby TrueHD. I finally received the remastered version of The Fifth Element from Sony yesterday, and I proceeded to watch it last night. At the beginning of the movie I was switching back and forth between LPCM and Dolby TrueHD for about 15 minutes and came to the definite conclusion that LPCM is just way more dynamic and powerful sounding than TrueHD. It was very noticeable.
I can't really comment on DTS-HD MA because I've never heard it full fledged yet, only down-rezzed.
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