I started with Ruger revolvers. I've had SP-101, RH, and SRH models, as well as a bunch of SAs, from .22-.454. Everyone came new with some form of QC problem, with the .454 SRH being the best and the .45 RH and .32 SP-101 bringing up last place together. Over seven years back, I discovered new S&Ws - and now have all S&Ws and no Rugers. Fewer revolvers, but what I want and enjoy.
If you compare the 6-shot 686, SKU #164222 & MSRP $909, to the Ruger GP-100, KGP-141 & MSRP $701, you'll see they even have similar weights: 39.7 & 40 oz respectively. Of course, construction is different - hammer forged and heat-treated for S&W and cast SS for Ruger. I had the GP-100's lockwork in my SRH - and a down-sized version in the SP-101. While they are better than the old RH lockwork, the S&W is finer and capable of a far better trigger.
Something else to consider - if you like more rounds, S&W makes the 686+ and 620 with 7-shot cylinders. Also, the slightly larger N-frame 627s are 8-shooters - just not available from Ruger. The 627 Pro is a particularly fine .357 Magnum that comes with a great mix of 'extras' as standard - but it's MSRP is $1,059, making a great discount price, like my local pusher's of $769, more than the Ruger's MSRP. Of course, they aren't the same thing at all.
The best buy from S&W in a .357 Magnum is the 620, SKU #164401 & 36.9 oz - a 4" 686+ 7-shooter with a partially lugged barrel with an MSRP of $893. S&Ws come with a warranty that connects you to their Customer Service via an 800 number - and free overnite shipping. Ruger even makes you pay for the call. As I got older, I found my interests changed - and I enjoyed my S&Ws more. YMMV. Good luck and please keep us apprised.
Stainz
PS That 627 Pro is my favorite .357 Magnum.