I've not tried either, but friends of mine post to smugmug. However, the best advice I read was that having your own site is far better than just post photos to any of the photo sites. It tends to place one away from the crowd.
Personally, I have had a web site for some years before any of the photo sharing sites came into existence. Thus, my paltry participation in any, but flickr. I joined that one only because several photography friends are on there and that was our only way to share photos.
I think having one's own web site is the best way to go for the obvious professional appearing approach. Hosting fees are quite affordable and in some cases building a site is easier than learning photoshop.
--Bob
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.