head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Basketball shot-timing and scheme-reading against human or scripted defenses.

Execution · Competitive PvP
The Wii U Smash that restored competitive pace and a huge roster of labbable kill confirms.
NBA 2K13 leans Execution (Competitive PvP); Super Smash Bros. for Wii U 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.
NBA 2K13
Stick handles and shot release timing decide possessions
Super Smash Bros. for Wii U
Perfect pivots and precise aerial spacing reward sharp hands.
Super Smash Bros. for Wii U leans a little harder on reads, though the gap is small.
NBA 2K13
Online play is constant scheme and tendency reading
Super Smash Bros. for Wii U
Ledge-trap and landing-trap guessing against humans never converges.
NBA 2K13 leans a little harder on variance, though the gap is small.
NBA 2K13
Shot RNG and loose-ball physics add noise
Super Smash Bros. for Wii U
Tripping removed; only minor move RNG remains.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K13
Playcalling, rosters and matchup exploits reward study
Super Smash Bros. for Wii U
Rage mechanics and kill-confirm percents are deeply labbable.
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.