I default, (by which I mean redirect non-'www.') to 'www.' simply because if you have a few subdomains too, it makes sense in a 'grand scheme of things' kind of

I default, (by which I mean redirect non-'www.') to 'www.' simply because if you have a few subdomains too, it makes sense in a 'grand scheme of things' kind of way ... www. dev. old. cdn. etc etc ...