Supercomputer
WOPR Computer
According to TOP500, the fastest computer is currently (as of September 2017) the Sunway TaihuLight, at a speed of 93 petaflops. I don't know whether this is also the most expensive computer.
An Atomic Force microscope is the most powerful type
Supercomputer
computer science is the most powerful degree
The most powerful water type is Suicune.
Gamma waves are the most powerful.
The most powerful normal type move is Giga Impact
supercomputers
gamma rays are the most powerful
The most powerful (thus fastest) super-computer in the world is in Japan. Its name is the "Computer K." While the most powerful super-computer in the US is the Jaguar Super-Computer and is located in California.
Talking biologically or technologically? MOST POWERFUL: Biologically, our brains are the most powerful "computer" in the world. It is highly developed and advanced. Technologically, there isn't a certain "most powerful" computer/laptop in the world. Companies like Dell, HP, or etc. are always coming out with new technology, so, who knows? LEAST POWERFUL: The least powerful? Well, probably the first computers every invented. At the time, they were considered powerful and useful, but now, since technology has improved so much, they are now considered useless. As for the most widely used type of computer...GOOGLE the statistics of the use of different types of computers.