A nice touch is the slight bevel around the BU1 AC, guiding your fingers during quick swaps.
ACDelco Professional D1741C Multi-Purpose Relay 3.6 x 2.2 x 1.7 inches
Many people say the GE relay swaps right in, so there is little downtime.
A nice touch with OLS is the clear pinout printed right on the outer sleeve.
You will find that this relay from OLS feels solid and dependable in everyday projects.
For quick prototypes, I tend to reach for Miniduino because the brand keeps effective.