Before knowing which assembly language is best and which assembly language should I learn, you should know why and for what you want to learn assembly language, because there are many types of assembly language. According to your requirement, any assembly language is best for you,
Best assembly language according to your needs
Common - Currently the most popular assembly architects are the assembler ARM, MIPS and x86. ARM - Used on a lot of cell phones and many embedded systems. MIPS - popular on IBM CPUs, x86 - assembler is used on Intel PCs. There are different versions according to each hardware that operate on 16-bit to 64-bit instructions.
Assembly language for knowledge - If you want to crack, modify, track and evaluate hardware performance issues and software, you should study assembler and BASIC instructions on either ARM, MIPS or x86, as the general essential instructions are almost the same.
Assembly language specialist - - If you want to become an assembly language expert, then you should focus on any one assembly language, as well as study about the processor architecture associated with that assembly language, because according to the functionality of the hardware in any assembly language, there are many special To understand the instructions, it is very important to understand the hardware architect.
Conclusion
Conclusion - Each type of CPU architecture has its own set of instructions. which has led to the development of many assembly languages, even though there are so many languages, their keywords and instructions are similar to make them understandable to humans, So you need to study the basic instructions of any one assembly language and assembler. If you want to become expert and want to understand hardware then you should study hardware architecture with assembly language,