head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
Arcade car control across loose surfaces, weather and door-to-door packs.

Execution · Pure Mechanics
An arcade tennis game rewarding precise timing and reading human opponents.
Dirt 5 leans Execution (Pure Mechanics); Virtua Tennis 4 leans Execution (Pure Mechanics).
Virtua Tennis 4 leans a little harder on execution, though the gap is small.
Dirt 5
Sliding off-road cars on mixed surfaces is the whole test
Virtua Tennis 4
precise shot timing and positioning
Virtua Tennis 4 leans a little harder on reads, though the gap is small.
Dirt 5
Pack racing adds light wheel-to-wheel jockeying
Virtua Tennis 4
human opponents can be out-predicted in rallies
Dirt 5 leans a little harder on variance, though the gap is small.
Dirt 5
Dynamic weather shifts grip unpredictably
Virtua Tennis 4
minor ball-bounce randomness
Dirt 5 leans a little harder on optimization, though the gap is small.
Dirt 5
Car class knowledge and line choice reward study
Virtua Tennis 4
minimal build depth, mostly play skill
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.