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

Optimization · Practiced Mastery
A minimalist action adventure about toppling sixteen colossal puzzle-bosses.

Execution · Practiced Mastery
Memorising stage routes and executing them cleanly for ranks and speed.
Shadow of the Colossus leans Optimization (Practiced Mastery); Sonic Adventure 2: Battle leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Shadow of the Colossus
Climbing, grip management, and sword timing on moving giants.
Sonic Adventure 2: Battle
Speed-stage control and rail precision reward clean hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Shadow of the Colossus
Colossi follow fixed behavior patterns.
Sonic Adventure 2: Battle
Two-player battles exist but stay shallow and scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Shadow of the Colossus
Encounters play out nearly identically each attempt.
Sonic Adventure 2: Battle
Stages are fixed; Chao stats are deterministic grinding
Shadow of the Colossus leans a little harder on optimization, though the gap is small.
Shadow of the Colossus
Each colossus is a solvable climbing puzzle.
Sonic Adventure 2: Battle
Rank chasing means memorising routes and score lines
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.