The differences among the SCRIBO Feel, La Dotta, Piuma, and Flow are in the shape and filling system, not the nib. Feel is the original flat-sided piston filler, twelve facets. Flow takes the faceting further with 24 facets, also piston-filled. La Dotta is a rounder piston-filled pen. All three piston fillers draw bottled ink into the pen with a 1.42 ml ink capacity. Piuma is slimmer and lighter, and it uses a standard international cartridge/converter system, so you can use cartridges or fill from
SCRIBO bottled ink with the included converter. The nib options stay the same, so this choice is really about how you want to fill the pen, not which one writes better.