Thus is an ordered list, from best to worst. Considering how often there are both anime and manga forms of a story and since I've often done both, I've combined both into a single list. I don't think I ever read a bad manga, so even the worst on this list is still solid. It just becomes higher quality as you move up the list though. Enjoy. :)
  1. Psyren
  2. Code Geass
  3. Your Lie In April
  4. Gurren Lagann
  5. Attack On Titan
  6. No Game No Life
  7. Death Note
  8. Death Note
  9. Cage of Eden
  10. Serial Experiments Lain
  11. Claymore
  12. Deadman Wonderland
  13. Angel Beats!
  14. Highschool of the Dead
  15. Naruto
  16. Onani Master Kurosawa
  17. Gamaran
  18. Parasyte
  19. One-Punch Man
  20. Kill La Kill
  21. Plastic Memories
  22. RWBY
  23. Lives
  24. Brynhildr of the Darkness
  25. Elfen Lied
  26. Fairy Tail
  27. Dusk Maiden of Amnesja
  28. Puella Magi Madoka Magica
  29. Bleach
  30. Veritas
  31. Sword Art Online
  32. Fire Fire Fire
  33. Black Cat
  34. FLCL
  35. Cavalier of the Abyss
  36. Immortal Regis