head to head
Defense Grid 2 asks more than The Elder Scrolls V: Skyrim, and the gap is optimization.

Optimization · Pure Optimization
A classic maze-building tower defense won almost entirely through optimal layouts.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Defense Grid 2 leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans a little harder on execution, though the gap is small.
Defense Grid 2
Occasional orbital-ability timing, otherwise hands-off
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Defense Grid 2
Fixed alien wave scripts, nothing adapts
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Elder Scrolls V: Skyrim leans a little harder on variance, though the gap is small.
Defense Grid 2
Spawn schedules are deterministic and previewable
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Defense Grid 2 leans clearly harder on optimization.
Defense Grid 2
Maze routing and tower economy are a solvable puzzle
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits 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.