I own a 686+ and I love shooting it ... but it's not my choice for home defense for two reasons ..
1. Only 7 rds, when most semi-autos offer more. My nightstand gun is a 4-inch Springfield 1911 ... It holds 8 rounds, only one more than the Smith, but ...
2. Unless you practice reloading a revolver a lot, a semi is almost always easier to reload. I keep a spare mag next to the 1911 and can swap them out in just a very few seconds.
There are a load of semi's, including a bunch from Glock if you insist on owning one, that offer far more capacity than any revolver ... My Springfield XDm-9, for instance, holds 19 rounds ... with a spare, you can hold off a (small) army from cover until help arrives or you've stopped the threat ...
Why don't I use the XDm? I prefer a weapon with a safety when I'm reaching for it in the dark as I am rudely awakened by my barking dog and/or breaking glass ... that's just me ...
Good luck ... save your money and get both, you'll love shooting the 686 ... but get night sights on the semi and keep it handy ...