Quick googling says that Piorun is heavier, slower, smaller payload, and smaller operational range. But even if it is better, can Poland ramp up production to meet the demand?
Mass
Missile – 22 lb (10.1 kg)
System – 35 lb (15.7 kg)
Effective firing range
0.16–8.05 km (.1–5 mi)
Warhead weight 6.6 lb (3 kg)
Maximum speed 745 m/s
Mass
16.5 kg (36 lb) total
10.5 kg (23 lb) missile
Operational range
400 m (1,300 ft)–6.5 km (4.0 mi)
Warhead weight 1.82 kg (4.0 lb)
Maximum speed 660 m/sModern Stingers share a guidance package with the AIM-9X Sidewinder and, unlike the Piorun, have dual mode imagers that work in both IR and UV which makes them impervious to flares.