The Battle takes place at Marineford and all blood-lusted
Akatsuki side includes EMS Sasuke and Ten-Tails
Marines & CP9 includes Seven warlords
so who would win?
Assuming the tailed beast are involved; The Akatsuki should take it since they're all mountain level in dc and durability plus the "ten-tails" (the OP is definitely not biased for putting him in) just makes it overkill, at this point no other combatant really matters except maybe Aokiji since he could freeze them but there's no way he's getting them all especially ten tails. Although, if no tailed beast are here then Marines should win. They have a healthy speed, dc, durability, stamina, and home field advantage. The only problem I see for them is Tobi with his hax but he would be easily overwhelmed.
This, its a little one sided with all of the jinchuriki and the Ten Tails involved.
9 Tails is basically Mountain level+ 10 Tails would be like a city buster
That would make the 10 tails inferior to the 9 tails. It requires more power to destroy a mountain than a city.