UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Transition Your Forum From HTTP to HTTPS

A couple questions.

In the past many years ago I had a rule forcing EXAMPLE.com to become www.EXAMPLE.com somewhere
Now when reading a bit about .htaccess it seems that it nowadays are more common to do the opposite.

Now when I am about to transit HTTP to HTTPS could it be wise to also don't use 'www' in the url?

it might be good to know before changing in CP and then switching all links to HTTPS in the SQL.

I see that this UBBCentral forum and Gizmo is using WWW in his agardner forum and [name] is forcing WWW into NON-WWW in their forum.
What is the advantage/disadvantage to use HTTPS://example.com vs HTTPS://www.example.com

Thanks for your input