Hmmmm.
This is something that pops up in my thoughts, but actually is down to the airline you want to work for.
I will give you an example.
In Cyprus due to the fact that the locals have been under the British for a few years , most of the laws and systems,(roads, electrical power,aviation etc...) is just like back home.
DCA of Cyprus used to be under the CAA, so they have had this culture of hiring only pilots/engineers who had a CAA issued lisence for years.
Now, I know that in the last selection, some pilots who had a Greek lisence, tried to apply for a place but failed to get through.
A key individual in the selection told me that they do not really care if you have a lisence issued in the UK or Poland, just as long as it is a JAA.
Personally?
I believe in will take time for the JAA to be established in airlines like this one and if you have a CAA lisence, it plays a major role under the table.
But I believe that you cant get better training than the UK, but is always down to personal opinion.