Neither, there is already a struggle with the 75mm f5.6. The 90mm f5.6 or larger aperture lenses are BIGGER. Yes, the back focus distance is longer with a 90mm which might aid in this problem, but this is a folder camera which does not completely benefit from the slightly larger image circle over a f8 90mm. One some what in-between is the Rodenstock 90mm f6.8.
None of which will make your images "that" much better once all other variables (camera support, film, processing, print making and a LOT more) are accounted for. In real world image making with modern wide angle lenses, it is not worth the struggle to try for that projection of an ideal wide angle lens. Get a f8 or f6.8 90mm modern wide angle and move on.
If you're really serious about getting the absolute most out of a modern wide angle lens.. get a monorail camera with a bag bellows. This can and will address every limitation imposed by a folder.
Bernice
I have both the Nikkor 90mm f/8 as well as the Schneider 90mm XL, and have used both on my Linhof Master Technika, as well as other 4x5 cameras.
I would never bring the giant Schneider out in the woods where I'm schlepping gear long distances. However if I'm shooting architecture and not carrying things very far, and want a bit brighter image on the ground glass and perhaps a bit more image circle, I'll bring the XL.
Your question about CF's has been asked a lot, and some of the opinions presented will be highly subjective. Whether or not you need it depends on your shooting habits and sensibilities.
Here's a shot from my Linhof MT and 90XL from a few weeks ago:
My Nikkor 90mm is on a recessed board, a Gaorsi-brand board that I bought after getting fed up with the crappy Linhof QR system on a Linhof board I bought second-hand. Linhof recessed boards suck...IMO.
The 90mm XL is on a flat board.
Thanks, btw!
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