Cruise Type ... a Shortcut

Luxury Cruises:   
    Regent Seven Seas Cruises:    all-inclusive luxury, 
    Crystal Cruises:                        historically synonymous
                                                      with luxury. 

Premium Cruises:  
    Celebrity Cruises: a blend of modernity with luxury,
                                 younger clientele, high-end amenities:
                                 spas fine dining.
    Princess Cruises: aka "Love Boat" line, all ages but tends
          to older adults and families, a step down in luxury but
          still high service standards and varied fun.

Adventure and Expedition Cruises:    
    Aqua Expeditions: small-ship cruises focused on: biodiversity & culture,
        intimate & educational experience, very immersive experiences; NOT  typical
        cruise activities.

Mainstream/Family-Friendly Cruises:  
    Carnival Cruise: aka "fun ships”: lively & party focus, young, families.
    Royal Caribbean: innovative activity features: water slides, ice skating rinks,
        & surf simulators; families..

Service and Atmosphere:  
     Holland America Line: classic elegance, older, many enrichment programs
         & focused on:  classical music, & onboard music, etc..

Value for Money:   
    Norwegian Cruise Line: good mid-tier option,  'freestyle' cruising: flexible
         dining times etc.;  a blend of luxury & freedom.