Got both, and have used both in parrel fopr events.
I challenge anyone to do a blind taste taste. The charcoal itself does not in part any flavor at all into cooking, if it does you are cooking wrong and not waiting for it to get hot enough. The flavor form grilling over charcoal or gas comes form fats and juices hitting the heat source below and vaporizing. Good quality charcoal gives off no odor.
There are a few difference, some pros and cons to each:
- Charcoal is just never as convenient, even within chimneys and electric starters. Charcoal is dirty, you have to keep a good supply, and it always takes significantly longer to prepare.
- Cheap gas cookers don't get as hot. Whether this is an issue depends exactly on what you are doing but for most foods it is pretty irrelevant. For searing a thin steak you want a good gas BBQ, or do what most restaurants do and use a cast iron pan.
- A poorly maintained charcoal grill wont be as hot as a good gas one. Worse still it can have uneven heat
- Gas BBQs always have he ability to lower temperatures which is very useful for thicker meats. With charcoal grills you can't lower the charcoal bed so easily and you have less control over temperatures when the re are flare ups etc.
- Good quality hardwood charcoal is expensive, and not so easy to find.
- Charcoals grills are harder to clean up.
- Good charcoal grills last forever. Even good gas BBQs tend to eventually need replacing, and they are more expensive
- not so much in the UK but in many countries, charcoal cna be banned outside or on balconies etc, while gas grills are more tolerated due to fire safety.
When it comes to smoking, e.g. rel BBQ there are some more differences:
- Temperature is irrelevant since you cook at lower temperatures
- Regulating an accurate temperature is important, this is much easier with gas, and can be made automatic.
- Gas BBQs generate more CO, less CO2 and more H20 vapor. The carbonmonoxide is a preservative, and will lead to a deeper "smoke ring", because as smoke ring has nothing to do with smoke but preserving the color of the hemoglobin. CO will also preserver the meat flavor more. This is the only time when there is a difference in flavor, and it is subtle and only comes about after hours of cooking. Many people prefer the meatiness of gas, others prefer the slightly drier taste with charcoal .The water vapor helps create a stronger smoke that sticks more readily to the meat. This is why you typically add a water tray to the smoker. The watervapor can keep the meat more moist (on the outside) while smoking. Thin is a personal choice, if you want the outside to dry right out then charcoal without a water tray would be better.
- In both charcoal and gas smokers, the smoke comes form the wood chips and has nothing to do with the heat source.
- Many professional BBQ joints in the US that regularly win competitions use gas smokers in house. Within the actual competitions there are sometimes regulation related to safety that prohibit gas, but in these instance often electric smokers win.