Not a Croatian, but I visit the Zadar / Ugljan area every couple of years. Last time a Bosnian friend visited from Banja Luka and she brought some tomatoes with her. They were phenomenal <3
Bosnian here from near Banja Luka and fully agree. Like others said it's mostly about being home grown and most importantly picked at the right time. But, Krajina tomatoes kick things ;).