On the eve of the final tomorrow, I did an in depth analysis comparing Neymar vs. Messi and the two teams over all so far in the tournament
(Note: Messi played in 6 games, while Neymar played in 5)
Legend: N = advantage Neymar, M = Messi, E = Even
Neymar vs. Messi
Goals/Assists: 2/3 vs 4/5 (M)
Chances created: 14 vs 14 (E)
Chances per 90: 2.80 vs 2.33 (N)
Total passes: 222 vs 255 (M)
Pass accuracy: 80% vs. 80% (E)
Goals per 90: 0.40 vs 0.67 (M)
Goal conversion: 12% vs 24% (M)
Shot accuracy: 41% vs 65% (M)
Team comparison:
Brazil has scored 12 and allowed 2 goals (10 GD)
Argentina has scored 11 and allowed 3 goals (8 GD)
Brazil's goals came from 10 different players (3 from defenders)
Argentina's goals came from 5 different players (none from defenders)
*Interestingly, these stats are similar to the 2019 Copa America, where 8 different players scored for Brazil (through the final) vs. 5 players from Argentina. Also comparing to the 2019 tournament, Brazil scored 13 goals through the final vs. 7 for Argentina (both having played the same number of games) - so Brazil needs just one more goal tomorrow to equal the number of goals scored in 2019. But one big difference, in 2019 they both only played 6 games, compared to 7 this time. So while Brazil hasn't had much trouble scoring, at least in most games, it seems like things were clicking slightly better in 2019, even without Neymar. Of course, we can't compare the two tournaments (last min changes, bad pitch, lack of fans etc)
Conclusion: while the duel match up between the two superstars gives Messi the slighe edge, the team comparison gives Brazil the advantage, having scored more goals, conceded less and better goal scoring distribution from the whole team. But if Neymar wants to do better tomorrow, he has to focus on his shooting and scoring. Yes, he has arguably been the best player in tournament (or as good as Messi), it would help if he had a bit more goals in the 5 games he has played so far. In fact, there are 4 different players who have scored more goals than him (3,3,4,4) . But , as we mentioned, as good as Neymar has been, there is more diversity in scoring for the Brazilian team, so that is a good thing if you are a Brazil fan like I am!
Main Source:
https://www.bbc.com/sport/football/copa-america/top-scorers