I have a 15" Geissele Mk8 rail on my 18" precision build, and a 13" Mk8 on my 16" precision build. I've been satisfied with them. If I were doing it again, I'd probably go with a rail that has external attachment for the Bipod, such as the DD Lite 3 DDM4 rail, or the Geissele Mk13.
Will you be doing your shooting mostly from prone? Ergonomics may not matter as much to you, which might push you towards a quad rail. I know with my 18" SPR, I could have done the quad because it's always shot from prone and the ergonomics don't matter. Just food for thought.
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