And I've only ever done Paris so I can't compare either....
But some points from me about Paris:
- I only ever got newsletters in French. I couldnt find an option for English or it didnt exist therefore I found it rather pointless considering I don't speak the language

- I found that the weather was really hot, and I struggled due to that.
- Getting around in Paris and to the start line was very easy
- Atmosphere was great and support was plenty
- Sights were amazing, I had to stop to take couple of photos
- Getting the medical certificate was a pain in the arse, and they were being pretty strict by the format of it... But I ended up writing it myself and they just stamped it without looking too much into it
- Safety pins are expensive and hard to find in Paris so DONT FORGET TO TAKE YOUR OWN!
I'm tempted to try Rome next year.
Edited: 31/05/2011 at 22:49