Boat fridges?

hi guys!..can you guys tell me what type of fridges you use in your boat, and what you do to power them(amp draw?)?...DC only?..propane?..solar?..big battery banks??
....my experince has only been with propane with my camper...i dont use a generator, but have been swapping RV battieries with the boat batteries as needed..relying on the alternators on my main and kicker!...one of the boat dealers i am talking to wants me to forget about propane and go DC only!, relying on the motors and generators only!...thanks larry

will i have to wean my self off of propane??