Thanks for another vote on UltraPro. If they’re actually identical… I don’t see any issue then.
More I think about it, if I’m using the Samsung V3 hub I didn’t realize it has a 500 chipset, then duh it doesn’t make sense to get a 700 series switch. And, just speculating but it’s possible the older switch may have better compatibility any how?
I’m going to call for help from @JDRoberts on this. I know I’ve seen posts here from people trying to reuse things that were purchased with/for an alarm system. Pretty sure they’ve had issues but I don’t keep track.
If I was starting over today I’d probably not do Z-wave at all. And I probably wouldn’t have a SmartThings hub. I had some very annoying Z-wave issues a couple of years ago that I only got past by replacing several Z-wave devices with Zigbee.
It sure seems like Zigbee is more flexible as far as choice of hub goes. Even Samsung has omitted Z-wave from their newest hub-like device. Then there’s Matter.
The newest SmartThings/Aeotec hub is 5 years old and no rumblings of a newer model so far as I know.
I like Zigbee. I like zwave. Each has pluses and minuses, so it depends what you want to do with them.
Z wave has longer range for an individual hop, UL certification for security systems, and doesn’t run into Wi-Fi interference which is why it’s historically been a good choice for fixed position devices like light switches. And there are plenty of good and interesting Z wave hubs available now, including the brand new Series 700 Z box from Zooz, the new homey, hubitat and Homeseer.
Zigbee has better power management, which is why historically it’s been preferred for small battery operated sensors.
When it comes to smartthings, I find its Z wave implementation to be less effective than that of much of the competition. I have a topic on that here in the forum if you want to see the details.
Gaps in SmartThings’ Zwave Implementation (2022)
So, yeah, I don’t personally recommend zwave with smartthings right now, although there are certainly a lot of people who do use it successfully.
As far as using jasco switches with the ring security system, yes, they work quite well if they are the specific models included in that integration. But the only rules engine that’s available is Alexa routines, which is good for simple things, but much less robust than what’s available with smartthings. And you can’t have them connected to both SmartThings and Ring Security at the same time. So it comes down to the details of what you need.
As far as this…
it doesn’t make sense to get a 700 series switch
Some features require that both the hub and the end device are on the same generation, but others do not. For example, you will still get longer range from a series 700 switch than you would from a series 500 switch even with a series 500 hub.
Series 800 is still too new, I think, and you do have to have a series 800 hub to get the real benefits of that. But a series 700 switch is going to provide a number of benefits over a series 500 switch if both are connected to a series 800 hub.
So I am the opposite of what most people have expressed in this thread: if I’m spending new money, I get the newest generation that’s stable. So, at this point, I would only be buying series 700 Z wave devices. I would put off getting a new hub until the series 800 stuff is stable if I could manage to wait. But sometimes that’s not practical.
But different things will work for different people. There are a lot of choices available now. 
Thanks for all the comments on Z-wave vs Zigbee and the Ring alarm. Following up on that, if the integration isn’t great I am definitely not intending to use that… I was just thinking of a backup plan. I’m thinking this basement project buys me about + 2 years until we out grow this house and we’ll start over with a new home + smart home and hopefully some of these things will finally have a better true standard.
One quick follow up to the UltraPro switch, I think I pasted the wrong link earlier, the pack that said 2 dimmer + 1 switch, I think that switch is a non-dimming smart switch, not an add on traveler (my bad)
I think this would be the correct 3-way add on and I’m shocked at both the $15 price plus the great reviews
The Jasco accessory switches are always cheap compared to the RF models. It’s a mechanical dumb switch, it doesn’t have a radio inside. It works by sending pulses along the traveler wire to the associated master switch.
If a mechanical dumb switch doesn’t have great reviews, something is really off. There just isn’t anything that can go wrong with those. 
The same switch in the enbrighten line lists at 2199, so 1539 is in line with that.
The enbrighten brand is intended as a direct to consumer brand to be sold at Home Depot, Walmart, etc. Nice boxes, some marketing, etc.
The ultra pro line is intended for wholesale to contractors, that’s why it’s typically 15 to 20% lower.
I’ve outfitted my place with Zigbee switches and Zwave outlets, to make sure I have a rock solid mesh, in GE/Jasco switches.
For anyone in Canada, I can highly recommend Aartech as a supplier. They always have good stock, and generally very knowledgeable if you have presales questions.