system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] If Mjolnir is simultaneously summoned by two equally worthy people (neither of whom are Thor), does it have a decision-making process?
gpt
Who wielded it last? Who's closest? Who's putting more oomph into the summoning? And, given Mjolnir's recently revealed sentience, who has more need?

Don't ask "What if they're all equal" because then there's no real solution.

Mjolnir will generally go with whoever was its 'master' last. Thor always ranks highest as the hammer's master unless he's unworthy for some reason, but otherwise it will go to whoever wielded it last out of equally worthy summoners. Distance, too. Whoever's closest will allow Mjolnir to respond more swiftly. Trying harder to summon it will have a stronger 'signal'. And, assuming Mjolnir's still sentient, it will measure who needs it most immediately if all other criteria are met.