Who had the healthiest relationship?
Sooo many bad relationships lol but I think most people would say Harry and Charlotte have the healthiest dynamic. Though I've read some people think he took advantage of her when she was vulnerable given he was her divorce lawyer.
Some people really like Miranda and Steve but Steve also gets a lot of hate and I personally find him so annoying especially in the first half of the show. Though maybe by the time they get married they have telly come to a good/healthy place? (I wish we could have seen more of her and Robert together personally!)
And Aiden was seemingly a great guy but he and Carrie were a bad match for many reasons plus you have her cheating and he never truly being able to trust her after that (and her refusing to just not have Big in her life!)
And then Smith and Sam I think are also a great couple and I'm still kinda sad the two broke up in the first movie! I haven't seen the second movie since it came out and honestly don't remember what happens between them in that one. But yeah Smith was great and I loved their relationship especially after she cheats on him with Richard which makes her realize her love for Smith.