Should I use Pastebin or Github for my scripts? And how would you make your script auto-update?

Pastebin or Github? Can you not auto-update from Pastebin? I don't even understand Github, it's a weird interface imo. Pastebin you can click one button and its copied; I understand its down to my own preference, but witch one(or another similar site) would you recommend?

How would I go about auto-updating my script? Is it just the Update URL?

I have one more question, one that would be the most helpful. How would I make it so that when the user presses Raw it automatically asks if you want to install the script?

I'll add how to auto-update scripts into the wiki; thanks!