I've owned a couple GP-100s and I've rented and shot a 686 and owned several K-frames in the past. To me, the hand-fit and length of pull of the GP-100 was a better fit to me and resulted in better accuracy than the 686 or any of my K-frames. All of the Smiths were exceptional guns, and I will freely admit that their double-action and single-action triggers were superior to any of the 5 Ruger double-action revolvers I've owned. But I shot my GP-100s better.
However, I'd like to disagree with the (wide-spread) notion that Ruger revolvers can be taken down without tools. Step one of takedown is to remove the grips, and all of the grips on my Ruger revolvers were held on with a screw. I used a screwdriver to remove that screw, and a screwdriver is a tool. I also used a screwdriver to pry out one of the wood grip panels and push the grip cylinder (peg?) through to the other side, removing the second grip panel in the process.
With a naked grip stud, the trigger spring assembly can be taken out with the tiny metal rod that is supplied inside the grips. That part is easy. Taking out the trigger assembly, however, is not easy. On a tight gun, I need an appropriately fitting Allen wrench and a hammer to get that stud pounded in far enough to remove the trigger assembly. The loosest Ruger revolver I ever owned still required me to press hard on an appropriately sized Allen wrench with my hand to unlock the trigger assembly. The manual says to use the trigger-spring group to push on that piece, but yeah, that never worked for me. I've tried.
So, at minimum, I'll need a screwdriver and an Allen wrench to field strip my Ruger revolver in the field. If I'm in an actual field, I will also require a table and chair, and maybe a bright lamp, to fix whatever is ailing my revolver at the time. I assume I'll be replacing a part that failed, so I'll need to have that part handy as well. I will need to know, in advance, which part will fail so I can carry it with me.
A Smith revolver requires two screwdrivers, or one screwdriver with the two tips that are needed. The action is not removable as a single component, but I don't actually see the benefit in removing the entire trigger group as a unit unless you want to hose it down with a cleaner or lube. In that case, it's a handy feature.