head to head
SCUM asks more than Guild Wars 2, and the gap is variance.

Optimization · Practiced Mastery
Active dodge-heavy combat with a deep build system, tested against both scripted content and human opponents.

Execution · Practiced Mastery
A hardcore open-world survival game where other prisoners are the real threat.
Guild Wars 2 leans Optimization (Practiced Mastery); SCUM 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.
Guild Wars 2
Dodge timing and active combat define moment-to-moment play
SCUM
Realistic gunplay and ballistics punish poor aim
SCUM leans a little harder on reads, though the gap is small.
Guild Wars 2
WvW and structured PvP feature real adaptive opponents
SCUM
Human players ambush and adapt across the island
SCUM leans clearly harder on variance.
Guild Wars 2
Loot RNG is present but secondary to skill expression
SCUM
Loot spawns and unseen players create constant unknowns
Guild Wars 2 leans a little harder on optimization, though the gap is small.
Guild Wars 2
Build crafting and rotation theory-crafting reward deep analysis
SCUM
Deep metabolism and gear systems reward planning
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.