Better Go for A51 rather than M51,
You won't get support of Samsung Pay, Samsung Pass, Good lock and it's module like Edge lighting, Sound Assistant, Task Changer, etc and Secure Folder will be provided in next update i guess. Plus A51 has CA and is supported for 3 years. I bought M51 yesterday for its SD processor and battery but didn't knew on software side it's complete shame compared to A51 on same Price.