Answer:
It all depends on the type of grill. You need to be just a little more specific. Maybe choose an actual model number or a price range and then you can compare what you can get with in that range.
You have different materials that make up each grill, different options, etc. But overall, Weber has been the leader in grills and have amazing grill selections. I have owned both a Brinkmann and a Weber and the Weber outperformed and out lasted the Brinkmann.
With that said it really all comes down to price and how well you take care of it and how often you use it. I personally have a Weber Summit S-670 (check it out at http://webersummit.com) which is a serious grill, but then again I grill A LOT!
But it has all the options, the food comes out perfect every time and even though it was a little expensive it has outperformed any grill I have ever owned and cooks better than every grill I ever owned. So it was worth it to me to invest a little more money.
Now I'm not saying you have to spend a million dollars on a grill, but it all comes down to your needs, wants, and affordability. Hope this helps.