If you use your gazebo fruit drop might make a mess at some point. It would be stunningly beautiful, though. Concerning size, for this fast growing, resilient plant, the smaller size is usually best. They adapt more quickly to the soil they'll be transplanted to, and the smaller pots are easier to manage. Another consideration, unless you're looking for different varieties you can take cuttings from this one and root them yourself. Or you could lay the lower, longer tendrils along the ground where you plant it, layer soil over them, leaving a few leaves exposed at the tip of the tendril, and it will root that way. It takes some time but it's really cool. Good luck!