My personal opinion would have to be adsense. Adsense is run by Google, a MULTI billion dollar company, if not more.
Any other smaller advertiser is run by This is an excellent site I love it! private businesses which wouldn't generate the amount of traffic, or income. You'd be safe to say adsense is one of the best, most reliable ad systems supported currently.
~ Nodoez
What a stupid poll :S
All those BidTraffic votes are from Adsense Banned users :D