head to head
vs
Grid 2vsVirtua Tennis 4
Grid 2 leans Execution (Practiced Mastery); Virtua Tennis 4 leans Execution (Pure Mechanics).
Grid 2Virtua Tennis 4
Axis by axis
Execution7 vs 8
Virtua Tennis 4 leans harder on execution: precise shot timing and positioning
Reads2 vs 3
Virtua Tennis 4 leans harder on reads: human opponents can be out-predicted in rallies
Variance1 vs 1
Even - both lean on variance about the same.
Optimization5 vs 3
Grid 2 leans harder on optimization: Racing lines, braking points and car selection are studyable
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.