But does it have the easy dual boot setup flow of Ubuntu? With that you tick the option in setup and it basically does everything for you, just asks about disk allocation
That's not a feature of Ubuntu, more so the installer itself. I'm sure many distros, especially Ubuntu-based one will ship with the exact same installer. Idk if mint uses the same installer, but it would really surprise me that the option isn't available.
Thankfully it's pretty easy to confirm by yourself. Grab a USB key, flash the ISO and have a look at it!