I mainly use adsense because they provide the pest payout per click but for my proxified pages where adsense isnt allowed I use adbrite plus they offer more than just cpc ads ie cpm,inline, interstitial.
For advertising I prefer adwords as they are good at serving relevant ads and this is good for me as I wouldnt want my tech blog to be advertised on an irrelevant site. Also I like being able to preload my account.
If youve never tried an ad campaign with a ppc than Id give bidvertiser a go since they are currently offering $20 free to sign up just set you max bids and daily budget low and itll give you an indicator if an ad campaign is profitable for your sit.
Get $20 in FREE clicks