Which are you favoring right now? Are you running more CPC adword campaigns, or are you favoring the CPM on targeted sites? I have only done cpc, but thinking about targeting some competitor sites.
I prefer CPC. CPM is harder to setup, but if you find the right site and track nice the results you will pay very cheap per conversion.
I've tried both but CPM proved to be more effective for me. It's a matter or individuality and practice. That is why they both exist and work.
Yes, very true. I saw some guys telling here at the forum that paid cents for conversion in CPM. this never happen with me.
I think you need both... But cpc is more targeted to someone looking for your product right at that moment.