Device Exclusion on ST

I’m fed up with ST and am planning on moving to Hubitat. What’s the best way to remove devices from ST before adding them to Hubitat?

Also, must I also delete the device from ST as well as exclude or are they the same thing?

Personally I would factory reset each device, then shutdown the st hub. No need to exclude them or delete them from st.
A factory reset will reset the device and ready it for inclusion in Hubitat.
This is true for zigbee and zwave devices.

If you do decide to exclude Z wave devices from ST, do it from Hubitat. I find it also helps to switch off the ST hub while you do. Dunno why, but it does...

Yes but I plan on running both hubs for a while as I slowly transfer devices. Will this still work if I don't shutdown ST right way?

When I did my migration I deleted from ST, did a factory reset and then included on HE. Think I had 1 or 2 bulky devices that I had to do an exclude on HE to get them to include but most came over without incident.