Is Gloria Macapagal Arroyo actually more corrupt than Erap Estrada?

From today's PDI Editorial:

IF THE Arroyo administration had hoped to cover the trail of the P728-million fertilizer scandal by barring top government officials from testifying at the Senate, then it hoped wrong. True, the Senate blue ribbon and agriculture committees couldn't get the full story, with Executive Order 464 getting in the way of the fact-finding inquiry. And because of the proclamation of a state of national emergency, they even had to call off the last hearing scheduled last Monday for fear that witnesses might be arrested for being a party to alleged destabilization moves in that legislative body. Still, this did not keep the Senate from laying the blame right on the doorstep of Malacañang.