I think Adbrite lets advertisers bid directly on a certain position of your site for a monthly fee (can someone please confirm that??) whereas Adsense forces your advertisers to do it through Adwords.
Adsense is good but Google doesn't guarantee a stable payout %... Worried they might reduce it drastically in the future.
Yes, for me is better Adsense. Has more advertisers, pays more for click and for me that I`m living outside of US the Wester Union payment method is great.
as you know adsense may block your account without no reasons thats why we want to know an alternative to that.