Why should you program in Assembly Language?

A) What are the two biggest benefits of using assembly language?

  As a general rule of thumb, there are a number of benefits.
    1 Faster Execution - 
      First, some assemblers are faster than others, but they are almost always 
      faster than higher level languages.
      
      Importantly, one of the main advantages of assembly language is that it 
      can produce very fast and efficient code. This is based on the fact that 
      assembly language is close to the machine code that the processor executes. 
      
      Assembly language eliminates the need for a mid level compiler stages or 
      interpreter that translates high-level languages into machine code. This 
      reduces the overhead and latency that can affect the performance of a 
      program. 
      
      Assembly language can also take advantage of the specific features and 
      capabilities of the processor (CPU) it was built for, such as registers, 
      flags, and instructions, that may not be available or optimized in high-level 
      languages.
      
    2 Smaller Size
      One of the main advantages of using assembly language for hardware or kernel 
      programming is that it allows you to write code that is fast and efficient. 
      Assembly language gives you full control over the hardware resources, such 
      as memory, CPU, and I/O devices. You can optimize your code to use the least 
      amount of instructions, cycles, and bytes, and avoid unnecessary overhead or 
      abstraction. This can improve the performance, reliability, and power 
      consumption of your hardware program.
    
B) Are all assembly languages the same?

  No, they differ in several areas.  Instruction labels can differ to what 
  resgisters are looked at for functions.   Some assember languages are just a 
  little faster than others.  Even the format itself differs from assembler 
  toolset to the next - even to the point of data space formatting.