head to head
Magic: The Gathering Arena asks more than Legends of Runeterra, and the gap is variance.

Reads · Mind & Math
A card game emphasizing priority-based reads over raw draw variance.

Optimization · Grand Arena
A deep card game blending opponent reads, draw variance, and sequencing.
Legends of Runeterra leans Reads (Mind & Math); Magic: The Gathering Arena leans Optimization (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Legends of Runeterra
Clicks only
Magic: The Gathering Arena
Pure clicks, no mechanical skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Legends of Runeterra
Alternating priority and spell mana create bluff layers
Magic: The Gathering Arena
Bluffing instants and combat tricks against humans
Magic: The Gathering Arena leans clearly harder on variance.
Legends of Runeterra
Less draw RNG than peers but still present
Magic: The Gathering Arena
Mana screw and topdecks remain decisive
Magic: The Gathering Arena leans a little harder on optimization, though the gap is small.
Legends of Runeterra
Tight deckbuilding and sequencing math
Magic: The Gathering Arena
Deepest sequencing, deckbuilding, and stack puzzles
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.