You can go with the hosted openX
https://login.openx.org/sso/login
and not have to worry about updates as well
It was pretty easy for me to pick up, just make a site, zones and place the banners. (it took me about 20 mins to figure it out the first time)
I haven't messed with the google version, but to me it's a "if it's not broke" type of thing
openX works effortlessly, and I think there is even a vb mod that you can use with it, not that it's needed.