Regarding wkhtmltopdf:
-
This thing works blazingly fast and it can also handle all kinds of HTML/CSS you throw at it, so when you need speed, you should seriosly consider it. We switch to it recently in our company and our PDF serving got enourmous speed-boost.
-
At least under Linux it needs XOrg libraries to be installed – servers usually don’t have them, so that might be your problem.