I've worked in places that used Macs, and others with Windows. Both included places I couldn't wait to get out of and ones I enjoyed. Certainly happier with Macs (IIcx was the first one) but the management was... not brilliant. I got out and found myself working in a place using mainframe computers with green screens.
I feel it is a bit odd surveying only the computers used, and not considering other elements which could persuade people to leave/stay. Which may be what Previn was saying, but I'll have to research Venn diagram