I think the best reason to go with the 10 speed is the compatibility issue. I finally have all my road and cross bikes with Shimano 10 speed which makes it easier to be able to use my road wheels as pit wheels. However, I would also say that my first year of racing cross it probably wouldn't have mattered as I'm not positive that I would have ran the whole course, changed my wheel and got back in the race. Now that I've been racing for awhile I would as I would want the points for our series even if they were for last place.
The only thing that I don't like about the 10 speed cassette is that it is much harder to clean out mud, grass and other random crap that accumulates when there is a bad weather race. The 9 speed was spaced just a tiny bit wider so was easier to dig out all the gunk. It's still doable with 10 speed but it is a little more work.
Have fun with cross!



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