It is a lot easier (and quicker) to make ocarinas with the 4-5 hole fingering (range of one octave) than the Budrio fingering (range an octave plus three) The more an ocarina's range is extended, the more difficult it is to get the upper notes to sound strong/clear/less airy. And the smaller number of holes takes less room, and allows for more decoration. That's why sculptural ocarinas *mostly have the 4-5 hole "English" fingering system.