Poochyena. Zorua's design never really appealed to me and it looks rather ugly in my opinion. Poochyena has been around with me since my childhood and has that nostalgia value, and I think it has a better design overall. Normally I hate dogs, but Poochyena appeals to me.
I have to go with Zorua. Poochyena is nice, but I just think that Zorua is much cuter. It has little adorable fangs, a tiny scarf around it's neck and it can transform into any other Pokemon, as well as any person, being very playful all the while. Zorua FTW ^^