Career PER
Manu: 21.7 (playoffs 20.2)
Pierce: 20.6 (playoffs 18.1)
Career True shooting pct
Manu: .590 (playoffs .586
Pierce: .568 (playoffs .552)
Career win share per 48 minutes:
Manu: 214
Pierce: 166
Per 36 minutes ppg career
Pierce: 21.5 (playoffs 19.1)
Manu: 19.5 (playoffs 18.9)
Total rebounds per36 minutes career:
Pierce: 5.9
Manu: 5.1
Assists per 36 career:
Manu: 5.1
Pierce: 3.7
Career 3 pt% :
Manu: .372
Pierce: .369
Assist pct (an estimate of teammates field goals assisted by player while on floor)
Manu: 24.1
Pierce: 19.3
Then there is
RAPM ( regularized adjusted plus minues) which I THINK has become the agreed upon best + - stat these days) where Manu consistently every year is one of the best in the league and consistently ahead of Pierce every season, but look for yourselves
http://stats-for-the-nba.appspot.com/
No way that Manu at least doesn't have a good case over Pierce.