The old fridges that didn't self-defrost are probably the most reliable. The only moving part is the compressor. No fans, no heaters, and fairly quiet. But the freezer compartment will ice up especially in humid climates and must be periodically defrosted which is a bit of a PITA.
Defrosting sucks profoundly, also the frost build=up makes opening drawers hard and prone to damage. Additionally it takes another fridge to store the contents.
