Gotta go with the wooden bridge. I love arched bridges because they're better for viewing the sky, and I also really like how it looks. The suspension bridge is unique as well, which makes it a close second for me.
I choose the Wooden bridge, I have a preference for oriental looking styles. I do like the cobblestone, suspension and brick as well! I think that all the bridges look nice depending on the theme of the village!
The wooden bridge was and still is my favorite bridge, even if I never had it in all the time
I'm playing that game. At least I can't remember that a villager ever suggested me that
bridge. Since I didn't had the chance to use it, I used as an alternative the suspension
bridge, which fit the best to my town theme.