HGC 100M Vs 5M

my office using HGC 5M long year..and just install HGC 100M today.

when I test Ping to China office server..

5M ms=65
but 100M ms over 350ms...

anyone know why? why use same ISP but have diffenet result? routing not same?
or how can I check


HGC 5M<--------bussiness plan?
HGC 100MB<-----which plan ?


all is business plan