With over 2000 different choir samples and FXs this pack is a go to for everything choir. Each file is labelled with the specific note which allows you to easily drag and drop into any song and also allows the opportunity to build progressions and loops from scratch. This was my go to for a long time after I created it and still is a staple of my sound library.
https://www.mediafire.com/file/n574xmtyxam67mg/Choirs_Of_Time_Link_File.pdf/file