head to head
Guild Wars asks more than Offworld Trading Company, and the gap is execution.

Optimization · Pure Optimization
Instanced online RPG where deck-like eight-skill builds decide battles before they begin.

Optimization · Mind & Math
An economic RTS where you bankrupt rival Mars corporations through market manipulation instead of guns.
Guild Wars leans Optimization (Pure Optimization); Offworld Trading Company leans Optimization (Mind & Math).
Guild Wars leans clearly harder on execution.
Guild Wars
Interrupt timing and kiting in skirmishes
Offworld Trading Company
Light APM, mostly market clicks
Offworld Trading Company leans a little harder on reads, though the gap is small.
Guild Wars
GvG and arena metagame against adapting humans
Offworld Trading Company
Live market PvP means modelling rival tycoons
Offworld Trading Company leans a little harder on variance, though the gap is small.
Guild Wars
Modest drop and spawn randomness
Offworld Trading Company
Map resource distribution varies per game
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guild Wars
Eight-skill build construction is the game's soul
Offworld Trading Company
Supply-chain math and buyout timing are deeply solvable
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.