head to head
Dissidia Final Fantasy asks more than Grand Theft Auto V, and the gap is reads.

Execution · Practiced Mastery
Arena duels mixing twitch dodge-punish play with RPG build preparation.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dissidia Final Fantasy leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Dissidia Final Fantasy leans clearly harder on execution.
Dissidia Final Fantasy
Aerial dashes, dodge timing and punishes demand fast hands
Grand Theft Auto V
Driving and shooting demand decent inputs.
Dissidia Final Fantasy leans clearly harder on reads.
Dissidia Final Fantasy
Human duels hinge on baiting bravery attacks and dodges
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dissidia Final Fantasy
Some equipment and summon randomness, mostly known state
Grand Theft Auto V
Some mission and lobby randomness.
Dissidia Final Fantasy leans clearly harder on optimization.
Dissidia Final Fantasy
Builds, accessories and matchup knowledge shape every duel
Grand Theft Auto V
Heists, money loops, builds learnable.
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.