Lightning
I actually really like Leafpool and Crowfeather… I don't know why, honestly. I just do.
I also really like Jayfeather and Half Moon. It does, as Lightflame said, give a bit more understanding to why Leafpool ran away with Crowfeather and helps drive the forgiveness thing forward. I also really admire the fact that even after Jayfeather left, Half Moon continued to wait for him and never actually took a mate, had kits, ect. She stayed loyal to him and waited for him, even after death.
I like Graystripe and Silverstream to a point. It wasn't quite as drawn out as it could have been, and Silverstream does have a point when she tells her father that she's old enough to make her own choices and all of that.