a 100 would equal a "perfect rivalry" (yeah, kinda rippin this from the "Constant of Jordan" guy)... here are some of the matchups I've done in order of best rivalries to worst (players marked with an asterisk performed better than their opponent)...
99.17 - Tony Parker** vs. Chris Paul
97.78 - Kevin Garnett** vs. Tim Duncan
97.72 - Shaquille O'Neal** vs. Tim Duncan
96.98 - David Robinson** vs. Hakeem Olajuwon
95.88 - Jon Barry** vs. Brent Barry
95.70 - Kobe Bryant** vs. Manu Ginobili
93.78 - Jason Kidd** vs. Steve Nash
93.76 - Shaquille O'Neal** vs. David Robinson
92.32 - LeBron James** vs. Kobe Bryant
87.54 - Steve Nash** vs. Tony Parker
85.37 - David Robinson** vs. Karl Malone
82.78 - Paul Pierce** vs. Carmelo Anthony
81.48 - Tim Duncan** vs. Chris Webber
81.41 - David Robinson** vs. Charles Barkley
79.45 - David Robinson** vs. Patrick Ewing
76.97 - Tim Duncan** vs. Karl Malone
75.52 - Tim Duncan** vs. Dirk Nowitzki
75.07 - Horace Grant** vs. Harvey Grant
73.10 - David Robinson** vs. Brad Daugherty
63.51 - Tim Duncan** vs. Amare Stoudemire
56.77 - Tim Duncan** vs. Rasheed Wallace
56.38 - Tim Duncan** vs. Al Jefferson
26.55 - Mark Price** vs. Brent Price
If anyone wants to jump in on this fun and request for a matchup (or a few matchups)... please feel free!
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