I mean, I just like wolves, but if I were to pick a fursona based on personality, it'd definitely be a... Hmmm. I'm not actually sure. But, I'll write out a bunch of fursonalities that I think different animals have, and we'll work from there.
Preds:
Lion - Fierce, Courageous, Usually in a position of power, Intimidating
Wolf - Cunning, Social, Loyal, Works well in a pack, Fast, Who doesn't like dogs?
Bear - Protective, Strong, Agile, Very territory oriented, Not very social, Not aggressive unless provoked
Dragon - Fast, Smart, Badass all around, Feared, Aggressive, Usually seen as mysterious
Fox - Cunning, Fast, Agile, Quick thinker
Prey:
Mouse - Goal oriented, Determined, Doesn't stop until they get what they want
Deer - Graceful, Easy to spook, King of the prey world, Smart
I dunno, that's how I see them. But I actually picked a wolf because I already saw myself in a wolf's position, because me and my cousin used to play pretend where she'd be an arctic fox and I would be a wolf. That, and I really liked Kathryn Lasky's book series, Wolves of the Beyond.
Honestly, if it weren't for my cousin, I would probably be a Siberian Husky right now. I've always had a strange fascination with them, I may even make a second fursona of one. Then again, I'm not the kind of guy to have multiple personalities. Woah, I got really off-track. Anyways, take your pick. Like I said, that's just how I see each species.