Do you think forums have the most traffic for adsense, or blogging. Where do you think the best placements are for google ads.
With equal numbers of non-returning visitors, forum is better. But forum visitors tend to return more, and they become blind to the ads very quickly. If you are trying to decide which you should build, get the latest version of VBulletin and build both
I think the blogging is the most traffic and best placement for google ads. Blogging is where your google ads is placed and seen while the forum posting is where you can promote your blog for possible traffic