Do Both
The Scott is massive and has twice as many riders, solo's and pairs and threes. It's run on the Stromlo dust bowl, but the course is awesome, with an fun downhill section.
While the MONT is more subdued, only half as many entrants, and only teams of 4 and 6 and was at Majura last year, Sparrows next year. The camping last year was right on the course, which was sweet.
The course at the Scott is twice as long as the MONT, but it's two seperate loops, so you get some variety.
I found the MONT more subdued, more chilled out, but the Scott is the "big event".
If your in a team of 4 or 6, do either event, they are both fanatasic, or better yet, do both, they are both awesome IMO and spaced 6 months apart. If you wanna solo, pair, three or corporate 10, then the Scott is for you.