I love Ivypool/Blossomfall to no end. nobody can stop me. i'm also a huge fan of Tallstar and Jake (confirmed canon maybe? i can't remember) and Leafpool and Mothwing.
buuuut my favorite canon couple is Brackenfur and Sorreltail. they are certifiably too cute. like, nothing bad should have ever happened to them, ever, they deserve all good things
and one of the few things i liked about Bramblestar's Storm was how they didn't portray Brackenfur missing Sorreltail in an overwrought, angsty sort of way. I don't really know how to explain, but it felt like what losing the love of your life could actually be like? like Brackenfur was depressed, but not angry, and he didn't use it as an excuse to avoid things. he was just really hurt and I think that was well done.