I have Picasa for family photos (I find it easy to share and hide photos).. I have Zenfolio for a business which has its own name and people find the pics because of the business.
But when it comes to artistic style photos that I want people to see, comment on...
It seems that flickr is the best choice, as it has the best community features which drive people seeing the pics.
Yeah, smug mug and zenfolio can protect pics better, and offer selling photos, but what good are they if no one finds the pics?
Sorry of this has been beat down before!