head to head
Super Smash Bros. asks more than Sportsfriends, and the gap is optimization.

Execution · Competitive PvP
Couch-competitive dexterity duels where reading the friend beside you wins games.

Execution · Competitive PvP
The N64 original that turned Nintendo mascots into a percent-and-knockback platform fighter.
Sportsfriends leans Execution (Competitive PvP); Super Smash Bros. 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.
Sportsfriends
Pole vaults, joust balance and ball control demand real dexterity
Super Smash Bros.
Z-cancels and DI demand fast precise inputs despite simple controls.
Super Smash Bros. leans a little harder on reads, though the gap is small.
Sportsfriends
Couch opponents bait and adapt face-to-face every round
Super Smash Bros.
Edgeguard and tech-chase guessing against adapting humans decides stocks.
Super Smash Bros. leans a little harder on variance, though the gap is small.
Sportsfriends
Arenas are fixed, nothing hidden
Super Smash Bros.
Item spawns add randomness; tournament rules strip most of it.
Super Smash Bros. leans clearly harder on optimization.
Sportsfriends
Minimal systems - the games are deliberately simple rulesets
Super Smash Bros.
Stage positioning and percent-based kill setups are 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.