Current BFe owner here. I replaced a 130/150 full sussed with it and love it. I went for a medium, at 5’10, which made it longer than what it replaced but not too long.
It’s incredibly confidence inspiring and I have smashed some PBs set on the full sussed with it. It just wants to hold speed, but at the same time is definitely still maneouverable as it’s not super long. I run mine with a 150mm fork, sagged a little bit more and have had no pedal strike issues on it.
Based on owner comments and reviews, i doubt you would be dissapointed by either. If you like customing and changing components, perhaps building the BFe makes more sense. If you want it now, gwt the Whyte.