I'm sure it's not a factor in their general popularity, but from an aesthetic point of view I think Pozidriv is inferior to Philips; pozidriv fastener heads loo

I'm sure it's not a factor in their general popularity, but from an aesthetic point of view I think Pozidriv is inferior to Philips; pozidriv fastener heads look messy with those 45 degree tickmarks. But both are inferior to Robertson/Square. Those look the most neat and trim of any screw head.