head to head
Dungeons & Dragons Online asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A dungeon-crawling MMORPG where labyrinthine D&D character builds are the true endgame.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Dungeons & Dragons Online leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeons & Dragons Online
Active dodging, traps, and jumping reward real hands.
Portal
Portal placement timing modest.
Dungeons & Dragons Online leans a little harder on reads, though the gap is small.
Dungeons & Dragons Online
Dungeon AI is scripted, never adaptive.
Portal
No adversary modeling player.
Dungeons & Dragons Online leans clearly harder on variance.
Dungeons & Dragons Online
Trap placements and dice rolls inject some randomness.
Portal
Deterministic chambers; no randomness.
Dungeons & Dragons Online leans a little harder on optimization, though the gap is small.
Dungeons & Dragons Online
Multiclass build planning is famously deep and solvable.
Portal
Pure puzzle-solving optimization.
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.