There are many choices for an OWB holster. I prefer the pancake style, which is very flat under a cover garment. IWB holsters which actually work for a large revolver are harder to find. The best of the lot is the Sparks VM2 - I have two for a L-frame (686) and N-frame (629), both 3".
An IWB puts a lot of tension on the holster via your belt, which clamps hard on the cylinder, making it hard to draw. The VM3 has a wide steel reinforcing band, which is stiff enough to allow one-hand reholstering, as well as smooth extraction.
The other issue is weight. A 686+ weighs about 40 ounces loaded, as much as a steel 1911. That makes your belt sag and digs into your side. You need an IWB with flat back and wings for good support. With a VM2, the cylinder tends to ride on top of your hip bone, which makes it bulge less and takes weight from your belt. I've worn it 10 hours a day in the Pacific Northwest. I'm thinking more of the 629, now that grizzlies are migrating southward.