PDs have a bit more teebird in them, whereas Starfires have a bit more firebird in them. the difference shows in the last third of the flight. Starfires are dumpy, and PDs are more penetrating.
Agreed.
PDs penetrate and glide better. Long straight flight, ending in a fade or a smooth long hyzer. Maybe slightly faster?? Starfire's begin to fade earlier and has less glide.
In addition, S-PDs come in weights as light as 150g, I don't believe Star Starfire's do. In my opinion, P-Line plastic is much more durable than Pro as well, yet has similar flight characteristics.