In my view ALE is good opetion to migrate VC data from Quality to production.
But when you also have Change management , its becomes tricky as once a object is created with one ECN in oen system, while migrating we may need same number to be available in next system.
So my suggestion is while making all such decision , involve a experiance consultant, or otherwise it will be mess.
Let me know , if i can if you need more details on same.
All the best.
Ritesh