I decided to go for the bundle of Horseshoe balloons in my second world, after using wings all throughout world 1. Didn't think I would like it when compared against straight up flight, but still tried it. I used it throughout expert end-prehardmode and hardmode up until post-plantera. Using it with the chillet has been super fun. Unlike my first world, this time I actually got incentivised to use my mount because of the air mobility of the balloons and the dash.
Anyway now I finally crafted Butterfly wings and I am feeling so restricted. Yeah I can fly for 3 whole seconds freely but my mount is out of mobility and it feels a lot less agile to me. I much prefer my quad jump iFrame-dash mount movement over flight at this point.
So yeah, bundle of horseshoe balloons. Absolutely busted in my opinion, and even worth crafting up in Hardmode.