With premier inn prices and country house prices respectively
You get what you pay for, Cunard used to be a 20%to30% premium over P&O , now it's more than double the price. I'm paying £14k for a 2 week cruise on Cunard QG and £6k for a suite on P&O, same price as Brittania on Cunard. Physically the p&O suite is better than Cunard, nice breakfast in Epicurean. However won't be QG food , will have to use speciality restaurants. P&O more of a family ship. So I know they will be different. However you can enjoy both