We should use better language when comparing bikes. There is no objectively better or best frameset on the market. Only the best frame to suit your personal riding needs. But even that is still very much subjective. Frames don't live in a vacuum.
Make a full list of the pros and cons of all the frames you are shopping for. And figure out what's important to you most. And which cons you can live with.
Regarding this, and considering that you tested the QuickPro ER:One with many wheelsets, do you think that a 36mm rear rim is too wide for the ER:One? I am specifically looking at EliteWheels Drive SL 58D SS (36 front, 34 rear) and Zen Carbon Vaporlite II (36 mm front and rear).
I measured the frame, about 8mm of clearance with my current wheel that is 30mm wide externally and about 6 mm of clearance with a 31mm tire.
36mm rim means +3mm on each side, so I would get 5mm of clearance between rim and frame...for the tire I would say that 33mm is the absolute maximum I would run (I would probably prefer a 32mm WAM tire).
What I am most worried about is the tire combination with the rim. 36 mm external is wide. 32 mm WAM x 1.09 is 34.88mm...36mm rim width seems reasonable only when running at least a 33mm WAM tire, otherwise is just added frontal area.
in your video about the Drive SL 58D CS you mentioned that you installed a Continental 30mm tire at the front, that measured 32mm WAM. however, on a 36mm front rim, that is outside both 105% and 109% rules (it is more like 112-113% rule).