I see it like this,
what you prefer to smoke out of is based SEEMINGLY on these 2 factors:
what gets you highest
what type of person you are

Bongs get me fucking ripped, and I FEEL that they utilize the most of my experience,
Plus, i'm a person that likes to take advantage of making big off of little.
So, naturally, bongs are my favorite.

But then again, some people have situational highs, and getting really high is based off of:
who you're with
where you're at
how many worries do you have

As for different regions preferring certain ways of smoking, that's coincidence in my opinion. Smoking is dynamic. Go figure.

Interesting observations!