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.

Execution · Competitive PvP
The classic 'dream match' team fighter widely held as KOF's most balanced competitive entry.

Execution · Competitive PvP
A lightning-fast competitive disc-throwing game that plays like Pong as a fighting game.
The King of Fighters '98 leans Execution (Competitive PvP); Windjammers 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.
The King of Fighters '98
Strict inputs, short hops, tight punishes
Windjammers
Split-second disc returns and supers demand reflexes
The King of Fighters '98 leans a little harder on reads, though the gap is small.
The King of Fighters '98
Human opponents constantly adapt and condition you
Windjammers
Human opponents bait, feint, and adapt every rally
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The King of Fighters '98
Near-fully visible game state
Windjammers
Almost no hidden information on the court
The King of Fighters '98 leans a little harder on optimization, though the gap is small.
The King of Fighters '98
Team order and matchup theory reward study
Windjammers
Character matchups and angle theory are studyable
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.