Wondering if it is preferable to use an SSR or mechanical relay to turn on/off my 110v Kress spindle with the controller? Have heard mechanical relays can cause EMI noise.

I have an old Techo Davinci, retrofitted with Mach 3 and Gecko G540, using the original Techno power supply w/ 5vdc. I'd use the 5vdc for the relay, and mount it in a separate box outside.

Looking at these 2 relays:

SSR -Schneider 9AS1D52-5 https://www.newark.com/schneider-ele...30a/dp/91F6493

Stand alone mech relay - iot Relay https://www.sparkfun.com/products/14236

Appreciate any advice, electronics is my weak subject, altho I did manage the retrofit, with some good advice.