What stands out about this unit is the Songle brand, which sounds reliable when you read the product listing.
100Pcs SL SONGLE Power Relay SRD PCB 4 Pins 5V 9V 12V 18V 24V 48V SRD-12VDC-SL-A
You will find that this unbranded relay pairs well with generic controllers, without any branding conflicts or odd fit issues.
What stands out about the unbranded brand is the lack of logos, keeping the look consistent with other anonymous hardware.
A nice touch is how the unbranded brand uses a bright indicator LED, so you know at a glance when it's active.
With Omron, you get a relay that feels solid in the hand and quiet.
You will find that the unbranded/general look helps when you're building kits for teaching or hobby use.
What stands out about the ARD4UR model is how simply it integrates with standard panels, and you will find that replacements go smoothly.
What stands out about this unbranded relay is that the pin layout is printed right on the top for quick reference.
A nice touch is the smooth spring action inside this unbranded relay, which feels reliable without being too stiff.
Because it's unbranded/generic, you can pair it with various sockets without visual conflicts.