He told the Radio Times: "Big Brother is about celebrating the talentless... Britain's Got Talent is 100 per cent about celebrating talent.
"It not only provokes genuine debate in a tough time for the country, it's put Britain back on the map as a producer of talent."
He added: "I think that Susan Boyle has come as the antidote to the recession."
Piers, who is four years younger than Susan, 48, added: "In one little old lady from Scotland we have the cure to all known financial ills."
Speaking about cynicism over the show's auditions, Piers assured fans that judges have no contact with acts before they go on stage.
He said: "I can tell you that on BGT the moment the acts walk in front of the judges is absolutely pure.
"We genuinely have no idea what is coming our way."