I suggest the TS to test drive both. You can be misled by a lot of subjective feedback and comments.

What I can say is:
1. Both are good cars.
2. Both fuel efficient and powered by sufficiently powered diesel engines.
3. Both come with good toys, SF3 is 3rd gen already so expect more high tech gadgetry.
4. Monty is practically same body and engine (except VGT was added later on) from first release to present, this makes it easier to get spare parts.
5. I have driven both, SF is more car-like because it's crossover, while I am more confident driving Monty in rough roads and flood prone areas.
6. You choose any one of these cars, you will be happy with it.

Good luck with your test drive and selection.