I agree that Adsense is probably better. Must admit though, Adbrite can earn you more than Adsense only if you get advertisers directly choosing your site to advertise on. I have spent money before that says I will worthly spend about $0.02 per click and it turns out that it was a false figure and I actually spent around $0.60+ per click.

depends what niche you're in, but u gotta remember that u want the most highly qualified traffic to make the most sales