what is the best Gaming Computer?

 Alienware Aurora Ryzen Edition R10

One you build yourself, that meets your needs.

The best Desktop gaming PC is going to be one that you build yourself, or at least through a company that uses high quality off the shelf components. 

The funny thing is most people who game on a PC use a prebuilt system, but in any forum you'll mostly find Custom system builders. So no matter where you ask, you're not going to get much of an answer...... unless it relates to Gaming laptops. If you're looking for a gaming laptop then get a Clevo if you can afford one, otherwise get an Asus. 

The best Gaming PC is going to come with a Ryzen 5000 CPU or an Intel 10700k or 10900k and an RTX 3080 or RTX 3090. The RTX 3090 is the best but the price is a diminishing return. For RAM look for at least 16gb. 32gb of RAM is overkill but it's future-proof because newer games are using more and more system RAM. Most of all you'll want something that has a quality motherboard and power supply that isn't going to fail. 

Companies like HP, Acer, Dell/Alienware, and Lenovo use OEM parts that aren't available to custom builders. While these are sometimes decent PC's, they have been known to skimp on quality and use under-powered CPU and GPU cooling solutions.

i think Alienware! is the best 

The Best Gaming Laptop is Alienware!

Desktop:   The one you build yourself

Laptop: Alienware.

Alienware!                                   .

Best (for you) is the one that runs the games you play in a satisfactory way.  And it must be affordable.

Since you give no clues what games and what budget, that is all that can be replied.

 Asus,Acer,lenovo are working best in gamaing laptop.actulally acer nitro series laptop are too much applicable for gaming

Asus also working with their vivobook  and rog series in gaming laptop. 

Mac is the best gaming computer ............