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What is the difference in the selection of MCB and MCCB for e.g. if my load is 63 Amps or 100 Amps, how I will know that the MCB is better or MCCB at different short circuit levels ?

The selection is based according to certain factors:

1- Ics ( service braking capacity ) as a percentage from Icu
2-Max operating voltage
3- insulation voltage
4- mechanical operation ( endurance and durabilty)
5- braking capacity for each operating voltage

As a comparaison you can check MCB C120N 3 pole  100 A   and MCCB NSX100N TMD100 3 pole.
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