A lot of people are saying that the oneplus one has unreliably hardware and buggy software. Reliability is much more important to me than saving a few bucks. I was planning on getting the Note 5 when the 64gb variant is available in Canada, but now I'm considering the 6P.
I had a OnePlus One, now my wife uses it and I watch with envy, holding the crap-phone that is a S6E. Would go back in an instant.