From a cruiser who is Regent Gold and Princess Elite. I have a few comments.
The most overall comparable experience is to get a Suite on Princess. Then you get free unlimited laundry and club class dining and you can get anything on the main menu for room service. This can be important because there can be a significant line to anytime dinning on princess. But you aren’t considering that.
So let’s talk about what I notice as differences.
Getting around. The ship is significantly bigger. Be prepared for more walking to just get anywhere when on board.
Shows The theater isn’t big enough for everyone to get a seat. There will be two shows a night. There is always a line for a seat at the early show and getting in line as much as 30 minutes before a popular show can be required for a seat.
Spa. This isn’t canyon ranch. Many fewer services offered. But the folks do tend to be good Up side, services are cheaper because it isn’t canyon ranch.
Staffing. The staff to passenger ratio is not as high. It’s rare to see someone coming around on the pool deck to take drink orders. I find it easier to stop at the bar, then find a seat.
Drinks. The “coffee” in the buffet is lousy. If you like coffee, get a package. Soda is crazy expensive. If you like soda, get a package. But... package is from the jet and doesn’t include cans.
Specialty dining. You know it isn’t included. We rarely find a night where we don’t like something on the main menu and thus rarely spend the money. Of particular note... they are not serving USDA Prime beef in the steak house. And the portions will not be nearly as large as in Prime 7. For me that’s fine as I can’t eat a full meal in Prime 7.
Shuttles. Big ship equals more likely to be docked at a commercial port outside of town and require the shuttle. Generally the shuttles are not free. I generally splurge on a taxi as it’s just more flexible
Trip and Port T-shirt’s. Princess generally has T-shirt’s with the itinerary And specific ports on sale towards the spend for $10 or so. They make great souvenirs.
Roll calls. More people means you’re more likely to actually have an active roll call
excursions. So much better! Not included. Another reason folks tend to be on the roll call setting up privates. Princess has way More options on times for excursions and you really will be able to take two short ones in a single day if you want. Also the tickets are in your room when you arrive. So no lines or waiting in the theater.
If you have any other questions, let me know.