ppc advertising is expensive for search engine traffic it would be good to build backlinks to your domain promoting the clickbank products
using ppc to promote clickbank product have high risk, but it have high profit also. many super affiliate use ppc technique
Im no master of clickbank but i know lots of people are making money with review site blogs a banner advertisement.
There really is no best technique, but here is my general strategy with clickbank. Find the keywords that profit/convert with ppc. Then create 3-4 sites in that niche chasing the keywords that you found with ppc and SEO the shit out of them. This is how I created enough monthly profit when I first started working online to fund other, bigger projects. Good luck!
I think it depends which product in which niche you're promoting. that's the key to find a low competitive niche
Of course PPC works but you MUST know what keywords to target and with what range. Otherwise you will be losing tons of money.
PPC is the best because it's an immediate return on your investment (if you get it right). collect email signups on your website and then you can promote to them long after you have stopped the PPC.