Smile Precure can be often seen as the franchise poster child incorporating everything that makes Precure, Precure.

Miyuki is like her cure name, Happy, pretty much without fail but it isn't brought on automatically and comes from her own courage, so it's a lot more bearable, it's also funny watching her faceplant everything.
Akane is the typical tomboy but with a difference, she's Kansai, so she does have more dimensions than other characters of her type but it's still not enough to be noticeable.
Yayoi is so frickin cute, that it's infectious; timid, crybaby, scared of her own attack but enthusiastic and happy to be part of the Precure.
Nao is a second tomboy? That's quite a rarity but her type is reliable big sister and caring about her family, doesn't really stand out much but then again this seems to be the curse of being a green cure.
Reika is this seasons graceful lady but is the most happy to go with the flow, she has the best character arc in the series and has the one of best solo battles in the franchise.
Hoshizora Miyuki - Cure Happy - 8.7/10
Hino Akane - Cure Sunny - 7.9/10
Kise Yayoi - Cure Peace - 9.0/10
Midorikawa Nao - Cure March - 8.3/10
Aoki Reika - Cure Beauty - 8.9/10
Best Dressed Award - This one is hard but if I had to be totally honest Cure Happy claims this one.