dbms_redefintion vs. table shrink

 For un-framgment segment and adjust HWM, we can use dbms_redefinition package or "alter table shrink".

As far as I can read, the restriction for above approachs are about the same.

Use dbms_redefinition is little bit more complicated than use "alter table shrink".

However "alter table shrink" need a table-level lock, even for a very short time.

Can anyone tell me which approach give us more benifit?

Thanks,