I have been tried many cruise lines, and been only with Princess since 1995. Reaching Elite status with the Captains Circle Club (return cruisers **excellent perks)
I love to travel, especially cruise.
One of the reasons I return back to Princess is overall quality & excellence. Not to mention to see all the friends I have met onboard.
Started out on the original Love Boat the Pacific Princess and built up gradually to the Grand Class ships. Most recently cruised on the new Crown Princess.
I think the others have covered some other important areas here too for a general overviews.
I have many cruise albums posted in my webshots link, take a look & see what Princess is like.
Good Luck & welcome