Give reason The SI system of unit is better than the MKS system​

The SI was and is intended to extend and refine the definitions used by the MKS. For instance, MKS had 3 base units, SI has 7. SI

There are two primary reasons that SI is better than MKS. Both reasons come under the category that the MKS system is a proper subset of SI. That means that SI will do everything that MKS does, so you do not lose anything of MKS in going to SI but the are things that SI offers that MKS does not