Hi Naveen.
Data Class change is also something that is taken care by BR*Tools.
From my perspective reorganization is much more simple.
If you would change DATACLASS in SE11/SE14 directly, then you have to activate the table. If something goes wrong (Murphys law) you may ed up in an inconsistent DB state. Solving such an issue can be easy or difficult depending on in which activation phase the issue happened.
Regards,
János