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

Reads · Grand Arena
A reads-heavy neutral game where V-System decisions and opponent modelling decide bouts.

Execution · Competitive PvP
The classic 'dream match' team fighter widely held as KOF's most balanced competitive entry.
Street Fighter V leans Reads (Grand Arena); The King of Fighters '98 leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter V
V-Trigger combos and meaty setups require solid execution
The King of Fighters '98
Strict inputs, short hops, tight punishes
Street Fighter V leans a little harder on reads, though the gap is small.
Street Fighter V
V-System neutral game heavily rewards opponent habit exploitation
The King of Fighters '98
Human opponents constantly adapt and condition you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter V
No RNG; match flow is entirely player-driven
The King of Fighters '98
Near-fully visible game state
Street Fighter V leans a little harder on optimization, though the gap is small.
Street Fighter V
Season-by-season tier lists and V-Skill routing reward study
The King of Fighters '98
Team order and matchup theory reward study
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.