The power delivery is somewhat similar to that of an SL55 AMG
but accompanied by a louder exhaust note.

To give a better explanation, it doesn't accelerate as fast as you would expect.

I can't really give an opinion about the feeling of the Carrera GT since we weren't allowed to drive the car.
The handling of the SLR is basically fool proof because of all the electronic aids.
If you plan to use either car as a daily driver I think the SLR would be the better choice;ground clearance,automatic and ESP among other things,but since I don't mind driving the GT with the concessions to comfort you would have to make, I could do without the SLR and drive the Carrera GT as a daily driver instead.