I went with a fridge because they're easier to find and they're easier to work with. The initial setup can be a chore, but long-term there is very little worry about.
• The fridge will keep beer within serving temperature without any modifications. It's a fridge.
• Thermal temperature change from opening the door is actually less than if you opened a regular fridge. The kegs--when full--will cool the surrounding air and the temperature of the beer won't be affected. It's a fridge, it's designed to be opened and closed.
• Mounting external faucets is a challenge because the door needs a good amount of modification. Depending on the amount of faucets you want to use, the cost is on-par with buying a faucet post.
• The freezer door on the top won't get in the way if you use the standard black handles that come with the faucets, and measure before drilling (the height of the faucets is obviously important). Using custom or longer taps handles is a bad idea, not because of the freezer door but because of the angle required to close the faucet. The top of the handle will hit the fridge before the faucet closes completely.
• Fridges are easier (IMHO) to find. I picked up a dent-n-scratch fridge for $200. I use the freezer to store hops and other treats.
I think this is a good thread. Lots of good discussion. I just wanted to throw my $0.02 in from my fridge conversion experiences.