It's better for all types of music if you can manage to do it without looking at "the dots".   The large chorus I belong to has just this year started doing a fair amount from memory.    We did a whole special concert (in a sold-out Kennedy Center concert hall), with some other groups, in February, from memory.   The two singers on either side of me were petrified---taking the sheet music from a classical chorus makes some feel they've fallen off the tightrope and there's no net.    But it was wonderfully liberating for the group--and now everybody knows the group can in fact do it. Which gives the whole group more self-confidence.

Without sheet music you have no reason not to watch the conductor for every nuance--which liberates the conductor for a much freer interpretation.

It also makes the sound better--no voice will be blocked by sheet music.

The audience loved it.

Admittedly we don't do it every time--not likely we'll be doing Hindemith or Britten from memory anytime soon.   But Carmina Burana has potential.