I like both of them in the show, at times I don't always agree with what they do, but when Kripa left she left Sur with Angad, because she thought that he would make a better parent, she left for 5 years and never did look back, that doesn't mean that she didn't and don't love Sur any more or less.
The difference is Angad wasn't aware that he had a son, even when she met him after such a long time, she never mentioned that Prateek was his son, now that is a big difference, he was never givine the option of choosing or having his son, because he wasn't aware that he had One...
As parents we can understand their dilema...a very difficult call...We just have to wait and see..