It all comes down to power issues
ARM vs. x86: The Future of Computing Power
Today, most computing devices are likely to have a processor of either the x86 design, such as Intel processors, or the ARM (Advanced RISC Machine) design, such as the CPU in your smartphone or tablet. ARM CPUs are also used in laptops.
Nowadays you can choose between a computer with an Intel or AMD processor (x86) or a device with an ARM processor. So when it comes to ARM vs. Intel processors, which one is better?
Modern Intel- and ARM-based CPUs can trace their technologies back to early chips in computers that hit the market in the early 1980s, most notably Acorn Computers' BBC Micro and the Intel 8088 found in the first IBM PC. These paved the way for the two most important CPU designs of the modern era.
