My only vapes are the Mighty and the Milaana.
Mighty wins for things like: MUCH cooler vapor without water due to the cooling unit, 0 chance of combustion due to the built-in thermostat, easier to pack and take with you (no removable pieces like stems and batteries), bigger bowl if you are the type who likes to take a lot all at once, you can sip on the Mighty due to its half-conduction nature
Milaana wins for: heat-up time, which is instant. Also the ability to better micro-dose, my usage has gone WAAYYYYYY down since switching away from the Mighty. It also feels better to use a device that only utilizes wood and glass (and a bit of mica) instead of the plastic that the Mighty uses, though I'm not sure if that is a benefit or not in terms of health (probably just paranoia centered around a really hot oven sitting inside a plastic case). It is also way easier to clean (you just need to clean the stem instead of having to take apart the cooling unit)
I'd almost say it was apples and oranges, I truly enjoy my Milaana but the Mighty is dead simple and provides really cool vapor, the Milaana is just hot, no way around it for such a short vapor path. The Mighty is a session vape and is totally enjoyable when passed around, the Milaana requires more reloading and thus is better for 1-2 people max.
If I could only have one I don't really know how I'd answer the question. I might lean towards the Mighty because of the cool vapor, that's something I kinda miss about the Milaana. Will look into a water adapter soon...