It is interesting to look at this over their entire career, or at least over CP3's career to date. So ran this with the cumulative numbers through CP3's and Stock's 13th year. Just about the only stats CP3 is ahead is in win shares, BPM, and VORP. DRtg and ORtg are basically a wash. Stock is ahead in all of the category percentages (Ast%, Stl%, EFG, etc.).
https://www.basketball-reference.co...ct=John+Stockton&player_id2=stockjo01&y2=1997
But you also have to take win shares and such with a grain of salt. They are at best an approximation and depend on lots of different factors. When looking at it over a season, for example, in 1990 Olajuwan put up a line of 24/14/4.6 blocks, 2 steals, 3 assists, yet Terry Porter, for example, had more win shares that season (close to the same, but a bit higher), along with higher ORtg, DRtg, etc. The very next season Porter had higher win shares and VORP than Hakeem. Would anyone claim that Porter was better than Hakeem? Would anyone in their right mind want to swap Hakeem for Porter? No. And not just no, hell no. A lot depends on their role in the team, their team's success, the other players around them, etc.
https://www.basketball-reference.co...ect=Terry+Porter&player_id2=portete01&y2=1990
https://www.basketball-reference.co...ect=Terry+Porter&player_id2=portete01&y2=1991