A nice touch is the heavy duty rating printed clearly, so you know it is ready for demanding circuits.
2-Pack 4 Pin 12V 40A Car Relay Switch – High Performance Automotive Solution
You will find that the unbranded design things basic, which makes troubleshooting quick and stress-free for most setups.
A nice touch is the sturdy casing on this unbranded relay, which feels solid without any rattles inside.