From a practical viewpoint, you can't lose! The 986S will have a little more power but the 987 will have some newer features and be a newer car overall.
Bottom line: Pick the one your wife or girlfriend likes best.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor