If it's one then it's the other too right? I think. For me at least it is.
Yes. And yes.
I've said this before, but for me, Oneplus is what represents Android the most appropriately. Even more so than Google.
Oneplus is freedom; economic, technological (hardware and software). Basically the perfect marriage of the two.
But that's just my opinion.
Being one almost automatically makes it not the other unless your sole deciding factor on what makes something the best phone is that it is the best value. Value isn't even on my list of what makes a phone "the best". Price isn't considered at all. Because I believe you can evaluate all of these devices on their own merits, rank them accordingly and then use price as a totally separate comparison to then see which gives you the biggest bang for your buck. How close you can get to the top of the list without overspending = best value.
OnePlus has IMO made a great many strides since they started, but they're far from the best OEM and the 3T is far from the best device. I could probably get away with pushing it into the top 10 or top 20 devices available, but it'd be a stretch because there are a great number of compromises that some other devices aren't making (they make their own). It remains a very small OEM making a midrange phone particularly to play at the price point. Their goal isn't to knock your socks off with quality everything... it's rather more muted, asking you to try to justify the extra $200-300 - what exactly is that money buying you? And it's a good question.
So with the way I evaluate phones, being the best value automatically means that you are not the best phone, unless we're in 2015, in which case a good argument could have been made for the 6P on both fronts... but it'd be very difficult to discount the 5X on the value front, so I don't think that argument would win. But being "the best phone" does not mean that it is the best phone for any particular individual, or even for myself. Same thing with the best value. It'd be easy to argue that the Moto G or even Moto E or ZTE Pro whatever with their rock bottom prices are the best value... but no one would ever try to position those as the best phone.