I use a monorail 'cause I'm cheap
I've used both wooden fields (Wisner Technical 4x5 and Ansco and B&J 5x7) and what I have now is an old Calumet CC400 monorail. Of these cameras, the Wisner was a lovely camera, the lightest of the lot, with plenty of movements for both landscapes and portraits. It was also, by far, the most expensive. The Ansco and B&J cameras were heavier and much bulkier but also much less expensive and are no-nonsense 'get the job done' cameras which were extremely durable and not terribly expensive. I currently use a Calumet CC400 monorail purchased dirt cheap via E-bay and will probably continue using it (at least, until I win the lottery!) I'm not a fan of the less expensive folding field cameras since 12" to 14" of bellows extension isn't enough for me. That said, I actually sawed a few inches off of the Calumet's rail, since it was 28" long and that was 'way more than I wanted. It has more movements than any of the field cameras I've used (but all of them had plenty for what I do,) and weighs about what the Ansco weighed (about 8 1/2 lbs., I think.) It's big fault is that it doesn't fold into a compact, easy to carry object. I usually just screw it firmly onto the tripod and carry it over one shoulder that way. It works for me.
For me, price was the ultimate arbitrator and the old Calumets are really pretty good cameras: solid, well built, and reliable. And cheap, often less than US$100. Oh, and that rotating back is just incredibly convenient!
For your own use, it would probably be very helpful to you if you could manage to use candidates for a day or even an afternoon. Or at least see them in person, practice folding and unfolding them, etc. We each want something different and it's hard to made a decision with so little information. Good luck!
mjs