That question is hard to answer as you need to factor in power and initiative. You would need to test lineups with two equal players, which is hard to find.

Also, check out space time fights (semi-finals and up) to understand my statement. For example: opponent 1 uses a kushina team against opponent 2 who uses kakuzu team and wins. Opponent 2 beats opponent 1 with a minato team. Both opponent can go back and forth switching their lineups to try to beat each other. There's also times where lineups are determined on when the player uses the mystery.

You're also neglecting that if both players have kushina and tsunade, it comes down their main and the 3rd character. That 3rd character can either be a better support or adds additional damage. There's a reason why in China, Kushina isn't used on a consistent manner in compared to our server. If more people had madara ten tails and had access to his breakthroughs, the meta would shift just like with kakuzu last year. Don't ignore the fact people in space time switch teams for a reason if they lose a match to beat the opponent the following match which does happen.