Photobucket <<<<<<<<<< Imageshack
Just saying. Google Imageshack. That is a lot more convenient.
You could use the attachment system, but if you're posting many pictures you would be filling your attachment space up quickly. Using Photobucket or Imageshack would probably be the best place to store pictures that you want to use in your posts, mainly because those have higher capacity limit than your attachment space or your own album space.
Photobucket >>>>>>>>>> Imageshack
Just saying. Google 'Photobucket'. That is a lot more convenient.
If you're uploading images just to put into a post and don't care about albuming, etc., use https://tinypic.com. C: It's the best.