I don't think I've seen a discussion on this before.

I've noticed that the upper end component groups are going to a 10 speed cassette, with the narrower chains and configuration for the derailleurs. Is this going to be durable enough for touring or would it be best to stick with a 9 speed setup? It looks like you can still get 9 speed components at the Deore level from Shimano, SRAM also has them up to the X.7 level, I think. I saw that Novara has a 10 speed set up for the Randonee and Co-Motion is showing it on its touring bikes, but the others I have seen have 9 speed, at least for this year.

Any comments/recommendations? Thanks.