I agree. That's such an obvious comparison but I've never thought of it that way before.
To me Vidic was simply the best defender, who reached a higher peak, consistency and did 'more'/was more effective on an indiviual level in relation to his influence on the team. Of course I'm not detracting from Ferdinand's performance, who was the better footballer and more than did his part.
But it's like Keane's role compared to Scholes. We wax lyrical about latter justifably but Keane was a force of nature, who's 'influence' and capacity felt more.
We may be seeing something similar to Bruno and Pogba.
Anyways weird post over. Sigh I miss the Serb.