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You can say all you want, but for me nothing beats The Doctor and The Ponds - the power of three
I know everyone loves the 10th Doctor and Donna, and I like them together too, but they gave off more of a "snarky roommates" vibe. They didn't really feel like a family. They enjoyed each other's company and loved spending time together (roasting one another from time to time) but they didn't connect on a deeper level. I mean, they were like college bffs. For me, at least.
As for the Ponds and the Doctor, or Amy in particular - they definitely felt like a family. Amy and The Doctor acted and treated each other like loving siblings - and, when their trips through time and spaces became rarer, they still needed to be together, to see each other from time to time - even if it didn't mean saving the universe. Hell, Doctor even stayed with them on Earth for a bit, which he had never done before. And it is just so cruel that when Doctor finally believed he had a home and people who were always there for him - the writers took them away. Painfully.
I'm looking forward to seeing Clara in the role of the Doctor's companion, but for me the golden trio will always take a special place iny heart