https://screenrant.com/sitcoms-perfect-endings-finales/

These 10 sitcoms nailed their series finales, providing satisfying conclusions with emotional farewells that left a lasting impact on fans.

I would say Saved By The Bell had the perfect ending with basically Zack chasing after Kelly than the 2 eventually getting Married and saying goodbye to your high school friends.

Little House On The Praire I guess would with blowing up the town but I wish they had Mrs.Olsen and Nellie and even the return of Miss.Beatle (Mrs. Simms)
Definitely Mary and Carrie since they started the show.

the middle overall did a great job. We never found out if Brick and Cindy ended up together.