Tylenol is an antipyretic meaning it can bring body temperature down, this helps with pain associated with fevers. It is also an analgesic (pain relief) by stopping certain nervous system pathways.

Advil is a non steroidal anti inflammatory, meaning it stops the bodies defence mechanisms that cause inflammation which helps with pain relief. Also helps with fevers somewhat and the combination of Tylenol and Advil can absolutely SLAP for pain relief related to fevers.

Advil and Aleve are essentially the same thing but Aleve is longer acting.