I would say it depends on the look you are going for, budget, and the setting for your ceremony. Is your wedding outdoors on grass? They go for the wooden chairs. Wooden chairs do better on grass than do the chiavari chairs with the slender legs. If budget and outdoor flooring isn't an issue then go for the chiavari chairs. They always have a classic look. Is it that the wooden chairs are standard and come with the rental fee and the chiavari chairs are an upgrade with an additional cost?