I’ll try to help...but no expert...we’ve done Disney,
Royal Caribbean, Norwegian and Carnival....Carnival was the least expensive and the youngest crowd....Norwegian has offers where you can pick the drink package for free.....RC and Disney were the most expensive.
For the times you can go I’d think the summer would be the least expensive price.....I’ve seen that cruises can be booked with URs but haven’t called for the pricing on them....my DH loves cruises....I’m not a huge fan since if it’s not calm I don’t feel good..so it’s not much fun