The www serves as a clue that it's a URL. Most people would recognize example.com as a domain even if given no other context. Contrast that with example.design. I think to most, www.example.design would be more recognizable.
http://hisham.hm or www.hisham.hm
Personally, I think www is. And it's shorter.
Everything I have tried is lackluster. I'm to the point where if something is qr only I just don't care enough and move on
I've noticed more and more recently a trend of billboards and things that just say 'Search [name]' instead of putting their URL there.
So correctly handling all standard HP synonyms is a good start for all sites.