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 · Competitive PvP
Fast arcade football execution with couch-multiplayer mind games.

Execution · Pure Mechanics
Tests twitchy miniature car control and track memory amid party-weapon chaos.
FIFA: Road to World Cup 98 leans Execution (Competitive PvP); Micro Machines V3 leans Execution (Pure Mechanics).
Micro Machines V3 leans a little harder on execution, though the gap is small.
FIFA: Road to World Cup 98
Arcade-paced dribbling and shot timing decide matches
Micro Machines V3
Tiny cars on twisty tabletops punish every slip
FIFA: Road to World Cup 98 leans a little harder on reads, though the gap is small.
FIFA: Road to World Cup 98
Couch opponents can be baited; AI cannot
Micro Machines V3
Couch rivals can be baited with weapons and nudges
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA: Road to World Cup 98
Bouncy ball physics inject classic FIFA luck
Micro Machines V3
Pickup spawns and chaos shuffle close races
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA: Road to World Cup 98
Simple era tactics and exploit goals are quickly mapped
Micro Machines V3
Track memorisation and shortcut lines pay off
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.