What's the disadvantage of system migration?

Our team have a new server now and our leader want to reinstall R/3 instead of migration.He asks me to give some reason that reinstallation is better than migration.Can anyone give me some advice?
the system edition is different between the old server and the new one.The storage space is also changed.

hi,
-> what do you mean be "migration"?
-> what do you mean by "re-installation"?
migration = os/db migration? if this is so, than this would be the only option to make a copy of your source system! (and the only one supported by sap as well gg)
re-installing the system would overwrite all data incl. database contents...
so, if i got it right (plz answer questions above!)...better make the migration in order to preserve system data...
GreetZ, AH

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