Great question! And, one that deserves to be answered on TheMensRoom.com!
So here’s the deal.
They are of course both single blade razors. However, the design of the angled head BIC eliminates the guessing game as to how close is “too close” by delivering a standard shave for everyone. Whereas, the DE Razor with it’s 180° flat head, creates an opportunity for more customization with each stoke of the handle.
With these 2 design differences the bottom line is going to be personal comfort. So can the both deliver a close and comfortable shave? Sure, especially if proper prep and post shave practices are present!
But for me, I will always choose the the ability to customize my shave. This way I can get a close shave based on my standards of comfort, and not one that is dictated by a specific design. My 2cents of course…