Bale is regarded as the best Welsh player since Giggs emerged from the Manchester United youth ranks two decades ago.
"It is all opinions I suppose," Ferguson said ahead of Sunday's clash with Spurs at White Hart Lane. "The boy is a good player. But Ryan Giggs at 23? I don't think there was anyone better."
On Giggs' next contract, Ferguson was not giving anything away on that front on Friday.
"Nothing to discuss at all there," he said.