head to head
vs
Gran Turismo 5vsrFactor 2
Gran Turismo 5 leans Execution (Practiced Mastery); rFactor 2 leans Execution (Pure Mechanics).
Gran Turismo 5rFactor 2
Axis by axis
Execution8 vs 10
rFactor 2 leans harder on execution: Industry-leading tyre model rewards only perfect inputs
Reads1 vs 2
rFactor 2 leans harder on reads: Competitive lobbies require some opponent anticipation
Variance1 vs 2
rFactor 2 leans harder on variance: Live track rubber and weather evolve in non-obvious ways
Optimization7 vs 7
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.