The best Pac song is so clearly Brenda Got A Baby that anyone claiming otherwise seems like they are from another dimension. Hit em up?
Unmentioned contenders:
Renegade Jay-Z feat. Eminem
http://www.youtube.com/watch?v=w1GZ6...eature=related
Da Graveyard Big L feat. Jay Z et al.
http://www.youtube.com/watch?v=bl2Jf...eature=related
The actual winner:
Notorious Thugs Bone feat. Biggie
http://www.youtube.com/watch?v=otPoBcBpgMg