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@OhWowMan great question that I don’t have a technical answer for, but I own both neck sizes and several different neck shapes. I think there is a definite difference in playability with the smaller width. I attribute that to the size of my hands.
As for the GS Mini, I have the Koa and can’t say anything but good things about it. The set up was great, very playable, and it sounds great.
There are stores that will let you rent or borrow guitars to try out at home. Just ask and you might be surprised. Also, most stores have a return or exchange period where if you dislike the guitar or want to try a different one, you can within that window they provide.
Gos luck with your decision.