Um, I've loved Clara with both 11 and 12.
With 11, it was an easy going, fun sort of relationship, but with an air of mistrust throughout S7B as 11 couldn't entirely trust her, due to not understanding how he met her before. Jenna was screen tested with Matt so they knew they had chemistry, but then they are a similar age, have mutual friends, and are part of the same "Primrose Hill Set" so it was hardly a surprise.
With 12, they picked Peter and can never have imagined how well they would spark. I've loved their relationship as it feels so "real", they have ups and downs, but their bond survived even when one overstepped the mark. I know some people don't like Clara's prominent position, but to me she's the nearest the Doctor has had to a genuine partner out of any of his main Companions (i.e. excluding River).
12 and Clara is nothing like 3 and Jo, but offscreen Peter and Jenna remind me a bit of Jon and Katy!