I think either is fine Kathryn as its sort of a 50/50 mix between the surfaces, however I ran in road shoes last year and planning on the same again on Sunday. The only issues I found was the field at 2.75k which was VERY boggy due to the downpour but hopefully it will be better this year.
As for that hil SteadyE, the plus side is that you have to come down it near the end!
I'm in! Last years weather was horrendous, and the first 300m uphill with a river coming down it definitely made it interesting. And also the water hazard after about 6km. Was my first ever 10k race last year. Number and chip came through the post this morning and only 10 days to go. Can't wait to be honest.