Also one advantage - no dark slide to have to mess about with
The dark slide is not really the problem some people make out. If you are shooting with just one magazine, you can take the dark slide out and treat the camera as one unit, just like the Rollei. When you reload the film, you simply pull out the mag insert, reload, but leave the magazine in place. No need to mess with the slide.
The advantage of magazines is that you can carry one or more spare mags pre-loaded, if you wish. Which you can't do with the Rollei. And the film magazines can be picked up very cheaply these days. At one point I had six . . . this is the major advantage of the 'Blad, that it is a true system camera. By combining various bodies, lenses, backs and finders, it can be almost any camera you want it to be.
But the Rollei is a lovely beast, provided you don't mind just having the one lens. And you
can get a prism for it, although I understand you wish to work with the WLF (and good for you). Both cameras have really nice features, like quick-lock straps, bayonet filters and lens hoods, and that aura of old-world quality.
I wish I still had both, actually. But I think that, in practise, these days I would use the 'Blad more often.
John