i would say this depends on two things:
1. how often you need to shoot architectural motifs, and
2. how good or exercised are your eyes for perspective corrections in ps.
probably if you have not much experience you will reach much better results with shift lenses..... and if you have the eye for correcting perspectives in a good way ,- you probably have done this often and than.. you will also need a shift system cause you will shoot often architectutre.
the pure quality is clearly better, if you use the nearly symmetric schneider or rodenstock wide angles than most if not all wides for mf systems. and if you correct the images fast you will reach a correction angle of 30degrees or something like that, and than you will have little bit more than the half of the resolution on the upper edge of the image.
cutting out the half of the image as you describe leads mostly to very flat panoramic images, or you have to cut not only the bottom but the edges too, to end up with a more 3:4 like format- than your resolution wil decrease too much and your wides will be not longer wide.
so all this things are compromises, they might work if you just shoot occasional architecture and the expectations of your clients may not be the highest..... otherwise it will become difficult, cause you simply use the wrong tools for your work.
aside from the pure quality question i feel much better on location if i see my motifs ion the perspective how i want to have it, its less abstract and more inspirating, i think.