I've got two 686s, both of recent vintage (an SSR 4" and a -6 6") and I love them both. I can't say enough about their accuracy, their smooth triggers, and their superb feel. Over the years I've bought and sold many guns but I've never found anything that I like as much as these two.
Recently, I had an opportunity to fire a Performance Center 627. I'd heard a lot of good things about the gun and I've read numerous laudatory comments about it on this forum, so I really expected something special. To my surprise, I wasn't really all that blown away by it. It has a nice trigger and it's extremely accurate. But, that doesn't make it any better than either of my 686s. It didn't seem to absorb recoil any better than the 686s. And, as for its 8-round capacity versus my two six shooters, all I can say is that I tend to count to six when I shoot, so the extra two didn't do all that much for me. I'd thought about buying a 627 before I tried it but, now, I'm content to stick with my 686s.