We have been cruising with Celebrity for the last 5 years. I personally don't want to change cruise companies since everything we want on a cruise, they offer.
The staff on the Infinity are amazing. They are friendly and cannot do enough for you.
The ship is very comfortable and just big enough that it doesn't feel at all crowded.
We had stateroom #6098. It is very close to the elevators and mid ship. Very quiet location. you look down on the lifeboats which some people like since they are not looking straight down at the ocean. Lots of room for clothing.