There is a serious debate about wood (charcoal) vs. gas, and everyone who is serious about grilling has a favorite (as evidenced by motherbear's reply above). Since this is a home design website, I assume you're talking about a built-in grill, as shown above.
What is "best" is determined by: what you will be cooking, how often you plan to use it, how many people do you plan to cook for, where it will go, how much space do you have, and how much money you have to spend. There isn't a single answer to all of those concerns.
To give props to motherbear, in some cases, the Big Green Egg is the best, but not always.
If you spend a little time on grill blogs, you'll find out what a great big, crazy world it is out there, and probably end up a little overwhelmed.
Figure out what you want to cook and what you want it to look like, and take that information to someone who likes to grill and who has built a lot of outdoor kitchens. They'll be able to help you out.

Hi sweep1,

If i understand your question correctly, you are concerned with getting the best results from your BBQ, and also having it be ascetically pleasing. Although we are fans of the Big Green Egg for tailgates and the like, we wanted something a little more formal in our outdoor kitchen. That's why we decided to do this with a Wolf Gas Grill along with Bluestone. It really has the looks and the performance.