If you go with zigbee, you can dump the manufacturer hubs, and go with a conbee II stick. With this homebridge setup, you can get most of the advantages of Thread, today (like mesh networking), and at much cheaper prices. I can buy an Aqara door/window sensor for $15 on sale at amazon (I think the normal price is $18). I can get a small appliance control outlet for $12 from ikea (and that's the regular price). Thread devices are just too expensive, especially ones from Eve, although I expect they'll slowly come down in price.
Also note that Thread and zigbee have similar ranges, as they're both based upon the same RF standard.
Look at the Aqara brand all device is compatible with SmartThings and they are really cheap I have few of it and no issue at all.
For mor information look at.: bspranger
https://github.com/bspranger/Xiaomi
https://www.amazon.com/dp/B07D37VDM3/
p.s. you don't need Aqara hub as Amazon description says.. with your SmartThings Hub it works perfectly!!
For more information you can also look at this video