Will be mini led tecnology better for our eyes? Will it use pwm?
If you mean micro LED I think it's sadly too early to tell
There are just few products outside with mini led pannels.
I've never tryed one of them because they are too expensive and not really avaible like the Asus 4K 144hz HDR mini led:
I think that the only avaible mini led display is the Asus ProArt PA32UCX.