(From my opinion)
1. Lego Marvel Superheroes
~Reason: You can play as every character in the Marvel Universe!
2. Lego Jurassic World
~Reason: You can visit Jurassic Park, play in all the movies [in the levels] and you can play as dinosaurs!
~Disadvantage: When you are big dinosaurs [ROOOOOOOAR] you cannot even exit the park where you are. Gates appear in front of you, blocking your exit. Raptors can jump over it but what about the big guys? They can't even jump!
3. Lego Batman
~Reason: You can play as the Joker, Catwoman, and other hero's and villains!
4. Lego Harry Potter
~Reason: You can cast spells and play levels in Hogwarts!*
5. Lego Avengers
~Reason: You can parachute off the Shield Helicarrier and play as the Avengers [including Loki and others but you must unlock them first!]!
6. Lego Dimensions
~Reason: You can go to all the worlds [including Jurassic World, Scooby Doo, Harry Potter (not entirely certain) and Bricksburg (a Lego Movie city)!
~Disadvantage: You have to unlock the world with Lego coins before you play them.
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* Coursety of my sister whose username is GemHeart. She loves Harry Potter!
I have played #2, #3, #4, and #5. If you have any questions with 2 3 4 or 5, please put it down in the comments.