Which photo sharing site is the best?

I have been using flickr.com. They’re great, but people have complained about sluggishness. I haven’t seen any myself. I am also a member of Photobucket and just as of today a member of Smugmug. Smugmug is all the new rave but it seems to convoluted and compact to be useful.

If you don’t mind, share your favorite host(s) in the comment section.