Hello student,

Actually in both of the positions the experience matters. Which means as the experience gained, the person will get  better salary.

For National investigation agency Sub inspector who is basically recruit through SSC CGL examination, the payscale differs from City to city. If your posting is is any mega city your payscale will be different, otherwise if your posting in a City then your payment will be different. Basically in hand effectively salary can be between 37k to 43k.

On the other hand for crime investigation department officer the average salary is near about 31k.

Hope it will help you