Sounds like you need to take these folks shooting.
They need to shoot their revolver and your shotgun.
You didn't tell us the caliber of the revolver.
I am a big fan of starting new shooters with 22LR.
Assuming it's a modern revolver, they need a lesson on how safe a loaded revolver really is.
Then they can make a decision and select the firearm they think is best for them.
I'm big on selecting a self defense firearm that the shooter has confidence in.
In all situations like this, it's shoot before you buy!

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NRA LIFE MEMBER