Those definitions pretty much are in line with what I envisioned. So now it is safe for me to say that i MUCH prefer the hybrid of the two. There was enough freedom of choice for progression in DAoC that I never once got bored even after all the quests were finished. There was always a 24/7 tower defense to do in RvR if the PvE was feeling thin.
I must be honest and say that I've only ever watched UO played for a few hours here and there, so I don't have a full spectrum of experience to draw upon to make the above statement.