I have not heard of any durability issues for the 686.
I'd personally pick the 7 shot.
Ironically, I don't have a 686-Plus. I have a Performance Center (PC) 586 L-Comp 7 shot and a PC 627 5" 8 shot. They're very heavy, and the recoil of either is minimal.
The only revolvers where recoil is noticeable is in my two Snubnosed revolvers.
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