Which types of SSD is faster NVMe or M30 SSD

Become faster of your computer speed you need to use SSD means M30 SSD. It depends on your computer configuration but if your motherboard support both of these I suggest NVMe is best rather than M30 SSD. Price and configuration says that M30 SSD is better than NVMe but in the practical performance NVMe is best. 

GIGABYTE
NVMe VS M30 SSD

The performance of GIGABYTE NVMe is better but price is low than M30 SSD. That I suggest you to use NVMe.