Go with 9 speed....you can swap out components/gearing with no fuss, and 9 speed seems to be much more reliable/bombproof than 10 speed in the long run. I think you have several years before 9 speed parts will no longer be made, so they will not be obsolete anytime soon.
__________________
2016 Trek 520 (54cm) touring bike for sale - never ridden. Message me for photos/details.