composite type vs table

composite type vs table

Hi,
I'm using composite types within my database and I sometimes need to 
modify type either by adding new column or e.g. renaming a column. Of 
course I can't do that on existing composite type (actually I can, but 
that is quite complicated) so maybe I should use table instead ? With 
tables (that are composite types too) I can do many operations, that are 
not available for composite type. I would like to ask, whether there are 
any disadvantages (e.g. performance) of using tables instead composite 
types (comparing only those functionality that is available for 
composite types) ?

Regards,
ML