So twitch seems better than UStream, at least for me. Close to my action on screen, less artifacts and better resolution. People's comments on the website are sent directly to the PS4 window. I'm not sure if PS4 viewers comments can be seen on the website though.
Some people have said their PS4 stream are archiving to twitch (and thus then can be sent to youtube. Mine appears to have not archived though, unless I'm doing something wrong (checked the box in the website settings).
I'll be streaming all night. Some watch me die over and over and throw grenades into doorway arches that promptly bound back into my face!