In my head it boils down to "Would you rather swim or fly?" which has an obvious answer. Also, flying ponies would still have access to other land cities while having gills and living underwater forever seems kinda limiting.
Thank Celestia the hippogriffs can do both!
Why not both?
It's like you didn't even see the episode! D:>
Seems like nobody likes going to the sea???????
You forgot another important thing. While as a hippogriff my mailing address might be on Mount Aeris, it wouldn't stop me from going to visit the ponies and explore the world.
Harmonizing Heights FTW!
This poll is missing the most important option: Retain pearl shard, live on both sides. Why in Celestia's name would anybody choose just one when they could have both?
I do love taking a swim in a lake, but flying would be the greatest thing. And the scenery up there is stupendous! If I want an aquatic adventure, I'll read one of those Martin Caidin books.