This is a question I am asked at least a dozen times every week. The answer is always the same: It all depends what your intended uses will be. A holster design that works well for range or field use may not be the best choice for discreet concealed carry.
Every holster design involves compromises among the 4 basic factors of comfort, accessibility, security, and concealability. Whenever one factor is emphasized there will be compromises among the other factors. Each user must decide which factor(s) are most important for their needs, and how much compromise of the other factors is acceptable.
Other factors that require consideration include your usual activities, your usual wardrobe, and any physical limitations you may have (range of motion issues in the hands, wrists, elbows, shoulders, etc).
Your 4" 686 is not a huge handgun, but it is substantial in both size and weight. For any holster to perform to its potential you should be considering a solidly made belt to support the weight and keep the holster firmly anchored in position. The belt is the foundation on which a carry rig is built; without a sound foundation nothing else can work as it should.
Best regards.