This is how I perceive the effect different heat sources have on the taste of food. Texture can also be influenced to a degree.
From the top down. The top being the best.
WOOD
LUMP CHARCOAL*
CHARCOAL BRIQUETS*
GAS either NG or PROPANE*
ELECTRICITY*
* May be enhanced using wood: chunks or chips... Used outdoors exclusively.
When cooking inside, I find that a gas oven wins over electric. Gas has less tendency to dry things out.
Does this align with your experiences?