I have not gone on either, but I am going in December. I did a lot of research and ultimately went with City View due to: 1) Groupon knocked several dollars off the price (and I somehow got a groupon coupon that knocked a couple more dollars off), 2) The Old Town Trolley seems to swing out to the east and go to hotels to pick people up and go to buildings that they own to try to get you to spend your money at their stores, while City View stays in the old town (which, ironically Old Town doesn't seem to do), and 3) TONS of reviews here and on some other sites generally prefer CV. Also, it seems as though all the cruise lines contract with OT for their tours, so their priority is to the folks that book directly through the cruise line.