we enjoyed our sailing on both lines. We feel that the dining experience on Princess was much better than on RCL, the waitstaff was top notch, very organized, food was good on both lines.
We had a mini-suite on the Golden Princess and really enjoyed that, the extra floor space, more storage and larger bathroom was very nice. it was perfect for two adults and one teen. On the Freedom we had Superior Outside Stateroom which was very nice, plenty of room, loved the round bed, stall shower was plenty large enough, just right for the two of us.
Its really hard to compare both lines are really good. If it came down to a choice between both lines sailing similar ships with identical itinearies the edge for me would go to Princess, personal preference