Who was more talented/gifted: Itachi Uchiha or Shisui Uchiha ?

Pretty sure like everybody important, including Itachi himself said Shisui was stronger/more intelligent etc than Itachi

Shisui I mean itachi learned a lot shit from him and shisui unlocked mangekyou at the youngest age

I don't think unlocking the mangekyou has anything to do with power.

@deactivated-5c830d4e319e6: Yeah, just means someone died that you held dearly at a young age.

Shisui.