One of the best parts of this forum is that everyone can express their likes, dislikes or opinions without fear or favour.
The Charcoal versus Gasser debate will continue until the end of time or until no trees are left to sustain our passion or gass left in the ground.
Coming from a different culture, (i.e. Australian) we have developed a different type of taste for our food. American food tastes very sweet to us, including the bread. Our likes are more of a savoury nature as exemplified by our full flavoured peppery Shiraz and the strong berry tastes of our Cabernet. One of the best examples of our preference for savoury tastes is “vegemite”, a thick black paste made from yeast extract. When I worked for Snap-on Tools and went to the USA for meetings and such like, I always took a jar of it with me to have with my breakfast, I can remember many occasions giving it to American co-workers just to see their reactions. Normally they would spit it out with very specific comments about where I could keep it and what they thought it was made of. Yet our children crave for it.
It has become apparent to me when barbecuing for friends or demonstrating barbecuing that the average Australian preferred taste comes from BBQ cooked on a gasser rather than from a Kettle or WSM. Having said that, the most common dish on a kettle is rolled roast pork shoulder or roast leg of pork, which is a traditional Christmas dish. Everyone in Australia who has a kettle will swear that you cannot beat that roast pork flavour.
I personally like the gasser mainly because my style of BBQs is more a fusion style. The fusion style is Western with an Asian influence sometimes coupled with Greek, Italian and Indian overtures. This is also influenced by the good availability of fresh produce and the cuts of meat available. One of my favourites was Tandoori Lamb Shanks, the shanks used to be 4 for $2.00 they are now smaller and $2.69 each, I don't do them very often for a big BBQ now.
So for the question of which is best the Genesis or Charcoal - IMO - it depends on what your and your family/friends tastes are and what your preferred style of cooking is.
To cover all bets, you should have as a minimum a: WSM, Kettle, Gasser with a side burner (Genesis or Summit) and a Weber Q for everyday use.
Regards