The 919 hot metal vs 919 forged comparison is quite interesting. The hot metal has a lower carbon content and a higher boron content which gives it a higher hardness and strength but at the same time it also has a lower ductility. The forged wheel has a higher carbon content and lower boron content which gives it a higher hardness, strength, and ductility but at the same time it also has a lower hardness
The 919 hot metal is more suited for high performance applications where you need a wheel that can withstand high loads for long periods of time. However, if you are looking for something that will give you better handling characteristics then the 919 forged is your choice.
919 hot metal pro vs 919 forged