I'd pick the glock. More ammo, easier to carry and shoot.
You are right about at least one point
The Glock does have more amo, no doubt, but honestly from what I have found so far, the 686 is more comfortable and easier to hide for me, even in shorts and a long t shirt....while heavier, the muzzle, frame, and grip are smaller and more rounded, and the gun fits great on my waist...I have compared the two in the mirror and the Glock you can see a bit of printing, the 686 not so much...the weight doesnt bother me in the slightest....
I also have found that I have a knack for long double action trigger pulls....why, I have no idea, I have much more time through Glocks than anything else...Glocks are what I learned to shoot on, yet I find that as I try other guns, I shoot them just as well if not better(in the 686 case)...38 specials, 38+p, or 357 magnum, I shoot the 686 as accurate as any gun I have ever picked up...and I have been shooting it exclusively double action, no cocking of the trigger to make things easier
Reloading and more practice shooting rapid fire are an absolute must at this point, but so far I am in awe of how good a gun this 686 is...I will always love my Glock but this S&W is in a whole other league as far as Im concerned......so far at least