head to head
Dragon Ball: Xenoverse 2 asks more than FIFA 99, and the gap is optimization.

Execution · Practiced Mastery
Arena fighting where builds and combo execution meet light PvP prediction.

Execution · Competitive PvP
Late-90s arcade football execution with couch-versus prediction and bouncy luck.
Dragon Ball: Xenoverse 2 leans Execution (Practiced Mastery); FIFA 99 leans Execution (Competitive PvP).
FIFA 99 leans a little harder on execution, though the gap is small.
Dragon Ball: Xenoverse 2
Combo strings and vanish timing need moderate hands
FIFA 99
Quick passing and shot timing in arcade-leaning football
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Xenoverse 2
PvP opponents bait supers and punish habits
FIFA 99
Couch opponents can be conditioned and baited
FIFA 99 leans a little harder on variance, though the gap is small.
Dragon Ball: Xenoverse 2
QQ Bang crafting and drop rates randomise builds
FIFA 99
Era physics produce regular fluke goals
Dragon Ball: Xenoverse 2 leans clearly harder on optimization.
Dragon Ball: Xenoverse 2
Build stats and skill loadouts shape every matchup
FIFA 99
Simple formations and known exploit angles map fast
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.