| | Re: Chorus or Choir
I'd choose "choir" - but then I'm British. "Chorus" for me is the refrain of a song - a few lines that occur again and again throughout the song (like We all live in a yellow submarine etc) or, if referring to a group of singers it's those in a performance of an opera who back up the soloists, or in a primarily musical piece where they back up the orchestra. In any case, to me it suggests a secondary role.
On the other hand, where the focus is on the group itself, I'd expect "choir" - which doesn't for me necessarily have religious connotations, but makes the group sound more important. But as you say - that could be because I'm British. Both terms are certainly usable. Choose the one you like best.