Well I mean there are supposed to be omniscient aren't there? Can't really touch that.. but I know what you mean.
I'll rank by series instead from my perspective...
1) Liar Game (Akiyama/Yokoya...)
2) Death Note (L/Light...)
3) Code Geass (Lelouch mostly)
Gamble Fish, Kaiji, Akagi, and Dr. Frost all come to mind as well but I won't list them because I haven't fully seen all that the series have to offer. Koon from ToG is pretty nifty too.
Do we count specifically on-panel feats or is off-paneled allowed as well?
Eg. Akiyama drove a company into bankruptcy which is a pretty good feat but the reader never saw the steps taken to reach there.