It is always good to have one from your own country...but the one issued on the Camino is also good..but limited in number of spaces for sellos (stamps).
A good idea would be to get the one in OZ and then get one in SJPP for backup in case you fill up the OZ passport.
Ian, I ordered Credentials for my wife and I last weekend, via this site, and received them today - many thanks. One question - on the inside cover, where you fill in your information, it says Fecha (date) then 'A favor de' and 'DNI' what do these mean?
Hi Andrew. Where it says "A favor de" just write your name or your wife's. It means "Issued to". Where it says "DNI" write your passport or ID card number. DNI is the Spanish achronym for "Documento Nacional de Identidad" (National Identification Document). Buen camino.