Should I use MongoDB or a NoSQL solution at all for this?
You certainly could do this but if revision control is what your after for documents use something like subversion or git.  In general storing documents that do not depend on transactions and you are not storing sensitive information that requires immediate atomicy and consitency like financial transactions then a nosql solution may fit your needs and be appropriate.

To the best of my knowledge you'd have to be rolling your own in the revision diffs if that's something you're really looking for whether from a nosql or traditional sql solution.

Regardless, if you're working on something trivial and want to play around with newer technologies that you're unfamiliar with that's great, go for it.

At the same time, if this is for a commercial client and you aren't familiar with mongo, couch, etc it's probabaly better to stick with what you know and leave the sandbox for play time until you're ready.