Good question. Seems like a personal preference and if you plan to setup the coffin as a stand and just play from there… or set your gear on a separate table / stand. Personally I’m a big fan of Pelican Cases as they are more rugged and customizable than coffin cases.
User SonnySeven did a pretty nice job setting up his mixer and two players in a vertical way in a single case. Of course your can change the design any which way you like with Pelican cases… See SonnySeven’s post here…