head to head
Super Smash Bros. Brawl asks more than Mortal Kombat: Deception, and the gap is variance.

Execution · Competitive PvP
The Deadly Alliance follow-up adding combo breakers, death traps, and online play.

Reads · Competitive PvP
The Wii entry whose slower pace and infamous random tripping pushed Smash toward defensive mind games.
Mortal Kombat: Deception leans Execution (Competitive PvP); Super Smash Bros. Brawl leans Reads (Competitive PvP).
Mortal Kombat: Deception leans a little harder on execution, though the gap is small.
Mortal Kombat: Deception
Style strings plus stage-hazard spacing demand control
Super Smash Bros. Brawl
Slower engine lowers the ceiling but spacing still needs hands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat: Deception
Human opponents bait death traps and breakers
Super Smash Bros. Brawl
Defensive bait-and-punish yomi dominates its floaty neutral.
Super Smash Bros. Brawl leans clearly harder on variance.
Mortal Kombat: Deception
Deterministic outside known stage hazards
Super Smash Bros. Brawl
Random tripping injects genuine uncontrollable RNG into movement.
Mortal Kombat: Deception leans a little harder on optimization, though the gap is small.
Mortal Kombat: Deception
Combo routes and hazard positioning are lab work
Super Smash Bros. Brawl
Matchup knowledge and ledge play reward study within a campy meta.
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.