I actually thought of this on a recent international flight on Korean Airlines. I would rather be in coach on Korean most of the time than in First on Korean. Reason? On these flights every time I have had an entire 4 seats across to myself to lay down and sleep.

So on a flight with an empty coach with a 4 or more seat across that I can get use of all to sleep in. I prefer that unless the option is a lie flat in first.

That said, in most cases I prefer a bad first.