Depends on how you want your bike to perform. Friction shifting can be great in certain circumstances and not so great in others. I'll never go back. I can shift on the fly when cranking up down rollers that need frequent shifting. Can't do that with downtube or bar end shifters. Small hands can have problems with bar ends in the situation described above. Just personal preference.

You look into repairing the Campy shifters? Campy parts can be rebuilt.