If you are adding a basemap styled in Mapbox Studio that will be uploaded to mapbox.com, it'll be super easy to add to your map with L.mapbox.map(). You can also store your data in mapbox.com and not have to worry about hosting other files, if you want.
Like #2, but more breakdancing.
Why should you switch to mapbox.js?
L.mapbox.map()
. You can also store your data in mapbox.com and not have to worry about hosting other files, if you want./cc @beccablazak @svmatthews @hamhands