The dance itself is espectacular, something you must see.
Unfortunately you waste a lot of time redeeming the ticket and waiting. If you buy a ticket online, this should be already the ticket! It doesn’t make sense to queue there for it.
If you go there, once you get your ticket there is no need to hurry to get a good sitting place. You can arrive 15 mins before show starts and you will be sat in any remaining place (even in the evacuation route!)