Bishoujo Senshi Sailor Moon, Futari wa Precure Recommendations
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.
There are beautiful girl-warriors, who are looking for crystals. Series have similar number of episodes. There are some cute pets-advisors too.
both have you finding an animal of sorts that asks you to transform to help save the world. both have you looking for lost crystals. both have a story of finding new friendships.
If you like Mahou Shoujo, but want that extra KICK (and I do mean it literally) in your everyday Mahou Shoujo anime, then PreCure is definitely the show to watch.
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!