Liverpool's net spending over five years on players is £82.5m and United's has been £85.5m. Meanwhile, Chelsea spent £154.8m net on players during that time and Arsenal just £3.4m.
Ferguson claimed his philosophy included developing young players as well as signing stars, while Benitez was more focused on bringing in established players.
He added: "We have signed 18 players in the last five years and eight of those have been young players.
"There's a balance, it's about doing the thing correctly. We like to try to develop young players and we will always do that. That's the nature of the club.
"Other clubs are maybe different and obviously Rafa has a different philosophy from mine.
"But that's the great thing about football - everyone has a different way of doing things."
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