we all have our own Ideas and Limits but you can hit 15 With out to much trouble .
None the less this is a comparison not a drinks question !
We Like the Celebrity Ships Layout is much Better than Princess, the Itinerary on Princess is the best we find it fits our needs well , staff is great on both and the food is good on both
All in all there very comparable to each other , we switched back to princess do to the price Gouging on celebrity i find princess more bang for the buck !
at the end of the day you cant go wrong choosing either ! but Princess for us is he Better Choice !
Dan