My best work is done w an ECB w a fist-sized chunk of wood to flavor. The disadvantages of this are the cost of charcoal, the need to have charcoal on hand, and the open flame that represents a danger if the wind gets up or some problem crops up.
My propane Smoke Vault is pretty much idiot proof. It does good work with minimal effort. If the need arises, I can turn the thing off and take the meat to either the fridge or the oven as I choose. I have smoked safely during thunderstorms and during high winds. Propane is cheaper than charcoal.
An offset type burning wood and or coals does great work. If you have access to suitable wood, it can be the cheapest to operate. It requires the most work. It also suffers the disadvantage of the open flame that is not too easily turned off.
I enjoy all three kinds. I am currently w/o a big ugly barrel wood burner...a situation I intend to rectify as time permits. I submit that you can't really make a wrong choice. I hope you enjoy smoking so much that you, too, will eventually have several types and enjoy each one.