Not knowing your disability, the good news is every one that you mentioned is better than the SP. Weight will be better and the trigger on the SP is unfortunately probably the worst of all revolvers. That the GP100 and 686 are much more expensive than the SP has got to be the reason the SP line hasn't dead off. I suspect most people like yourself run into it is smaller, but too heavy for actual purpose.
Pick any that you like most, you'll do fine.
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