Ok, to give a little more serious answer:
I like canines since I like characters as Tails and Wile e. Coyote, but also woodland creatures since I like characters as Conker the Squirrel and Sonic (do hedgehogs count as woodland creatures? ^^ )
Then I've seen some nice bird sonas, and of course I've grown up reading Donald Duck comics
It's really hard for me to pick only a few species I like the most as furries, as I like a lot of animals, and any animals can make cool furry characters. Plus the overall design and appearance of a character can tend to matter a lot to me and not just the species.
Though I suppose I do have a strong preference for cats, or felines in general, and some big cats. To name a few others I generally like, I suppose canines, mustelids, hyenas, raccoons, skunks, rabbits/hares, pigs, cows, horses, rats, foxes, goats, dragons (especially Eastern), bleh, the list goes on. Again though some of these can really depend on the art style; for example I am not as much of a fan of cow or horse characters that have more "humanoid" shaped heads (particularly with female characters). Then again I am not a big fan of that for furry art style in general, but I tend to see it more often with these species. Same with rabbits; I like rabbits characters that are a bit more realistic in terms of facial anatomy.
In terms of more fandom-specific, made up species . . . to be honest there aren't any I really have much of a strong interest in. I guess maybe sergals, and manokits. Airplane dragons are also cool. I don't really know a whole lot of the made up species tho.
I’ve always had a huge soft spot for avian fursonas. I really love the variety that they come in. There’s something visually pleasing about a naturally vibrant color pattern in the case of the tropical ones.
Horses are pretty neat, too. Really neat. Super neat. But it’s not like I’m biased or anything.
Felines, particularly big cats and specifically jaguars, especially the ones who don't bite into your skull as a form of informal greeting. But even if they do, well, its a worthy consequence from setting eyesight on such beauty up close and personal.