I'd definitely stay away from compressor units because that system has unwanted side effects for cigar storage. Here are the main two reasons why a friend changed to thermo-electric: his old compressor unit was drying out his cigars and it also was imparting unwanted "refrigerator" flavors to his smokes.
He used some "work arounds" with it for over a year before replacing it and loves his new unit (which is much like Les's and Robert's here). His son-in-law got his old wine cooler for storing (you guessed it) wine.
So unless the refrigerator w/compressor you're using or planning to use for cigar storage remains unplugged, get a thermo-electric for your smokes.