I like how the heavy duty housing protects the coil, even the panel sees bumps and knocks sometimes.
Azbil FRS100C100-2 AC100V 50/60Hz Multi Burner Control Flame Relay Used
When you unbox it, the label shows the brand NOFUEL, which feels straightforward and easy to recognize.
The LY2F-DC12 is straightforward, and the coil rating of 12V DC is easy to verify.
The LK-61644 has a neat look, and the labeling lets exactly what you are holding.
The Dxgtoza relay I got had snug fits on the lugs, which made hookup less of a headache.
The override switch lets you nudge the relay into a different state, which is useful during maintenance windows.