A nice touch is that the 2Pcs size fits well on a standard rail, and you can add more if needed.
Waterproof Relay Harness Kit 40A 14V DC 5 Pin SPDT Car 14 AWG Copper 2 PCS
It feels good knowing the 2Pcs are a manageable size and you will find that they fit well with other parts.
With the VF4-15F11, the coil voltage is easy to spot, and a nice touch is how neatly it snaps into place.
A nice touch with the ARD4UR model is the clear coil voltage marking, which saves you from second-guessing during quick swaps.