Question should i do a m.2

What's your current setup? If you have a HDD, then M.2 will definitely be better, but if you have ample SATA SSD storage right now, then M.2 might not make too much of a difference, depends on the type of productivity work you do - some see major improvements, others not so much, Games probably wouldn't see a noticeable difference between SATA SSD and M.2 SSD.