head to head
Nintendo Switch Sports asks more than Wii Sports Resort, and the gap is reads.

Execution · Competitive PvP
Motion-controlled party sports where reading your opponent's swing matters.

Execution · Pure Mechanics
Island-themed collection of twelve motion-controlled sports showcasing the Wii MotionPlus accessory.
Nintendo Switch Sports leans Execution (Competitive PvP); Wii Sports Resort leans Execution (Pure Mechanics).
Wii Sports Resort leans a little harder on execution, though the gap is small.
Nintendo Switch Sports
Motion swing timing and placement accuracy
Wii Sports Resort
MotionPlus precision in swordplay, archery and bowling
Nintendo Switch Sports leans clearly harder on reads.
Nintendo Switch Sports
Human opponents bait and counter in volleyball and chambara
Wii Sports Resort
Local versus duels involve mild feinting
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Nintendo Switch Sports
Light physics jitter and matchmaking spread
Wii Sports Resort
Slight physics and CPU pattern randomness
Wii Sports Resort leans a little harder on optimization, though the gap is small.
Nintendo Switch Sports
Simple per-sport strategy ceilings
Wii Sports Resort
Each event has small learnable technique optima
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.