AdWords post pay is better than AdWords prepay. Why? The clients that post pay their account typically do not have disruptions of service that impact ad serving that pre pay clients do.
I have several clients that prefer AdWords pre pay. They like the control of putting the money they want into AdWords when they want to. However, from an AdWords account manager standpoint, these accounts struggle. They will have so many times that the funding has run out and the client does not put money in that they lose important momentum that post pay clients do not lose..
If you are out of the AdWords auction for two or three days, sometimes you have to fight your way back in. I’ve seen a few instances when an account has not been funded for a week (the client is continuing to pay me a monthly management fee) and then after funding is added it takes nearly a week to get back on track generating conversions again.
I simply like the continuum that AdWords post pay billing provides to smooth out performance in an account. Before you decide to use AdWords pre pay, make sure to think long and hard about how much you will depend on AdWords for generating leads. I encourage you to keep the leads flowing steadily with post pay settings.