Better is all about perspective. Some here (like me) have one heck of a time controlling the temperature on a charcoal smoke (though I am getting better as I go). There is the ease of use thing where the electric will always win in that you plug it in and that's that.
The electric unit is, without question, cheaper to operate unless you happen to have an unlimited supply of charcoal/briquettes (hardwood is best)! Let's not forget about the nice, pink smoke ring that the charcoal unit gives you that is hard to come by in an electric.
Finally is the taste difference. Now, I have had smoked meats from charcoal, gas and electric and can tell you that there is a trade-off with the electric over the others. How much depends on your tastes. Now, that isn't to say that you won't get a great tasting Q from an electric because you can! If I had to nail it down I would have to say that the charcoal offers more flavor profiles over the electric.
This is, of course, just my opinion. I have all three (charcoal, gas and electric) and I like the gas best for controllability and ease of operation.