What is the switching time of sncp & mssp & which is the best for protection?

thiroticaly it is less than 50 ms

based on praivious experiance SNCP has some constrains on switching spectially if part of the link is passing throug other vendor equipment , plus the manual configuration 

while the MSSP has draw back of consuming the network resources

If it is Ring Network than SNCP is preferred & in Linear Network mostly MSP is used.

less than 50ms for all . SNCP is the best protection compared to mssp.