Ehhh, the 6.5x47L and. 260 are just as accurate, I don't care what the FPS sais. They both should give you great barrel life. So it comes down to brass really, and there's a clear winner there. 6.5x47 Lapua brass is virtually unbeatable.
I concur with every thing you said, except that Lapua also manufacture .260 brass. Products - Lapua