I do not like this question now that I have Journey haha. I feel torn. My brain tells me to scream "Toller!", because they were my favourite for a very, very long time and I felt like I'd found 'my' breed. I think I was wrong, though. I've totally fallen for Aussies and my heart tells me to say that Aussies are now my favourite.
I really love both breeds, though. But I feel like Aussies fit me just a little more perfectly, and I feel like they're a fraction more my favourite than Tollers are now. Which is not a bad thing, just unexpected. I truly didn't think I'd find a different breed that I enjoyed just as much if not more.
As for why I like these breeds?
Tollers: They're goofy, full of life, fun, eager dogs. In kind of a spastic, frantic way lol. But still, IME, easy to live with. They can be naughty and hard headed, a little selfish (in that they really don't have a strong desire to please - mine anyway has a very "what's in it for me?" attitude) and bratty, but I love watching Dance's little sneaky wheels turn in her head. She's just a happy, joyous little dog that never fails to make me laugh, even when she frustrates me, and I just get a lot of joy out of being around her and doing stuff with her. Also, I like that Tollers are (or should be) natural retrievers and that I didn't have to teach it. Big perk there for me and the games I like to play with dogs!
Aussies: I've only had one so far, but again, I love the zest for life and doing stuff. Be it learning, games, whatever. Journ gives me her all and then some with a big "what are we doing next, mom?!" smile plastered on her face, and at the same time she's also very focused and together and serious. I think that's what I love most of all: How unbelievably happy and full of joy she is but also with just the right amount of seriousness to balance it all out. And bouncy! What's not to love about a dog that thinks she's part bunny? And I don't know if this is a breed trait or just a trait of the dogs Journey comes from, but omg snuggly! I love how snuggly and cuddly she is, without being pushy or needy about it. And she's absolutely brilliant. The rate at which she learns amazes me, as it's been many years since I've experienced such a trait in a dog. She's such a little thinker and catches onto stuff so quickly and I love watching her offer me things with so much enthusiasm. I just love everything about her and could go on forever. I guess that answer might more be the answer to why I love Journey rather than Aussies as a whole, but the few other Aussies I've gotten to know share many of the traits that I love about Journey, too.