head to head
Dirt 5 asks more than Micro Machines World Series, and the gap is optimization.

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

Execution · Pure Mechanics
Twitchy miniature racing where handling beats strategy on chaotic tabletop tracks.
Dirt 5 leans Execution (Pure Mechanics); Micro Machines World Series leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt 5
Sliding off-road cars on mixed surfaces is the whole test
Micro Machines World Series
Tiny-car handling on cramped tabletop tracks is twitch-heavy
Micro Machines World Series leans a little harder on reads, though the gap is small.
Dirt 5
Pack racing adds light wheel-to-wheel jockeying
Micro Machines World Series
Human racers can be baited with weapons and blocks
Micro Machines World Series leans a little harder on variance, though the gap is small.
Dirt 5
Dynamic weather shifts grip unpredictably
Micro Machines World Series
Pickup spawns and battle chaos add randomness
Dirt 5 leans clearly harder on optimization.
Dirt 5
Car class knowledge and line choice reward study
Micro Machines World Series
Track knowledge is shallow and learned quickly
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.