Duh. Both show girls in a positive fashion, are animated by Toei, and have very similar plot designs (new villains replacing defated villains, cute mascots, learning the power of teamwork/friendship, etc.). If you like Pretty Cure, then there is no doubt that you'll like Sailor Moon.
Both have similar plot designs-- the girls must find and protect an object from evil forces to save the world, with the help of alien companions. Both shows have a strong emphasis on friendship, and both were animated but Toei Animation!
~ both have heros/heroines
~ both have mascots that allow them to transform
~ In both animes, they didn't know their partners/allies very well until they became superheroes
~ in both, the mascots can sense if something is wrong/weird
~they both deal with romance/crushes
~ they both have a clumsy main character
Both are typical Magical girls with cute stories,but also have cool drama storytelling as well,like most magical girls,each episode is a different slice of life each episode before fighting the "Monster of the week",however,unlike Tokyo mew mew and Sailor Moon,The first season of Pretty Cure and it's direct Sequel Pretty Cure max heart use DBZ-style psysical fight scenes,rather than magica wands
These two shows are both based around being gifted with a extra-ordinary power, In Precure (Prettycure) the two mc's have special cellphones that contain a character that allows them to transform. In Tokyo mew mew, they have power pendents which allows them to transform. They both fight against evil. In Prettycure they fight against the "Dark Zone"s minion whereas in Tokyo Mew Mew they fight against Deep Blue's Minions. In both there is a hint of romance, more in Tokyo Mew Mew compared to Prettycure. In both they gain new powers/members which make them stronger.
Both have the same thematic of light versus darkness.
Both have a stylistic and charismatic duo who fights against dark creatures.
Both have the good and the bad side trying to get a special item that will gives the owner more power.
Both have good dramatic fights and scenes.
Both show's have 2 main character's that use team work to win.
Character's are very similar to each other. Cure Black and Tiger both are laid back and would go in fighting. While Cure White and Barnaby are both very smart. Also they have smilier fighting styles.
These shows aren't really similar. Rather, if you've seen one, you might want to see the other to get what you were lacking. They're two halves of a good show.
Pretty Cure has the slice-of-life goodness that Nanoha shortchanges in the name of action. And real shoujo cuteness that's much better than moe.
Pretty Cure has shonen-ish fights that are fairly pointless. Nanoha also has shonen-ish fights (though in a different way; more energy attacks, less punching) where the characters really try and the fights matter more.
And both are really yurish.
These where my 2 first animes that proves how mutch similair they are and how mutch you can enjoy bote, bote have are Mahou Shoujo so girls that transfor and get magical powers and bote are with 2 girls as leadcharacter, bote are very cute and really bote are a great recommendation for every Mahou Shoujo lover