We are booked on RCL for Alaska. We can get a similar stateroom on Carnival and save $678. We have been on Carnival before and we were happy. It will be our first time on RCL. Comparing the itineraries (same ports) the schedule is better on RCL, longer times in ports. Can anyone tell me if RCL offers a better experience? Another consideration is that our reservation through Costco allows for no penalty cancellation sixty days out while Carnival will charge a penalty for cancellation and future credit only. Thank you for input.