I listen Itunes from my apple tv 4k device via JBL sound bar 9.1 is lossless better then AAC

Hello Cem18,

Thank you for using Apple Support Communities. Based on your post, you'd like to know if lossless is better than AAC.

As explained in the resource you came from: About lossless audio in Apple Music

"The difference between AAC and lossless audio is virtually indistinguishable, we’re offering Apple Music subscribers the option to access music in lossless audio compression."

However, lossless is supported with AirPods, AirPods Pro, AirPods Max, and Beats wireless headphones use Apple AAC Bluetooth Codec to ensure excellent audio quality. However, Bluetooth connections aren't lossless.

Hoping this helps out, take care.