A couple with the best dynamic and a couple with the worst

[M]

off the top of my head

best: Aaron Warner and Juliette (Shatter me)

worst: lowen and Jeremy (verity)

[Eesha]

best: any couple by mariana zapata
worst: percy and Sam from every summer after

[Soyas.Readingpalace]

best: Ravi and Pip (a good girls guide to murder)
worst: Luce and Daniel (Fallen, they were kinda boring)

[Larissa]

Best: Rhys and Feyre

Worst: Tate and Miles from ugly love.