My preferred method of cooking bacon is on a griddle with bacon presses on top of it. IMHO, this cooks bacon to, what I consider perfection. The bacon presses keep the bacon flat against the griddle, so it all cooks evenly. Also, the presses all but eliminate splatter. It does have the disadvantage of having to clean the bacon presses, in addition to the griddle. But cleanup is still at least as easy, if not easier, than any other method I've tried. And yes, just as included in the instructions on the bacon package, cooking at medium-low heat renders better bacon.
I've tried the oven method a few times, and have never been impressed. Far from the "perfection" that others claim. It cooks uneven. It splatters all over the oven. It takes WAY TOO long. Perhaps I'm doing it wrong, but there is nothing good that I can say about the oven method.
I will say, I've never tried the air fryer method. I'll have to give it a try, buy already I'm imagining that it has to be pretty messy? Just like the oven method?
I've never thought about using a deep fry. In a restaurant, where you already use a deep fry daily, I can see where it may be convenient. But at home, it doesn't seem like it would be convenient to pull out the deep fry just for bacon.