That's not to say which amp is the best but it does answer your question. I would drop the Marantz from consideration as it isn't in the same league as the other two.
It's up to you which sound you prefer between the Cambridge and the Rotel.
I can hear the difference but as I said before it's up to you to decide which sound is best for you. Since I know absolutely nothing about the purpose that you are buying this amp for I will have to leave it at that.
1. Clear sound. 2. Very good synthesis with speaker and subwoofer. 3. Full sound, because I have relatively small speakers (resonance box !!!)
I don't listen to classic music, but I love to hear Red Hot Chili Peppers, Led Zeppeling (Stairways to Heaven), Iron Maiden, Dire Straits and also (Hard)Trance.
Music where you can shiver from when there's playing a guitar, fine hi-hats and drum, vocal/voice.
I hope I can find a dealer who has both amplifiers so I can hear them closely after each other.