Like somebody else already said, ultimate droid v10 is cyanogenmod with a theme on it. So I would go ahead and update to the most recent version of cyanogen. In my opinion cyanogen is the fastest and most stable rom I've ever used
I ran Cyanogen yesterday. It runs pretty good.
There is a
definite difference in the 2 though.
UD v10 runs a little quicker and smoother. Also of note there is better battery life and reception on UD v10. I don't know why that is because they have the same baseband. Running Cyanogen I couldn't keep 3G up and lost some calls (which I've never experienced running stock)
I would have to give the edge to UD v10 in the comparo because of the above.