In a match like say 50 to 50... I'd say infected...
They can actually, think,and they and have almost superhuman strength and speed.
But on the other hand... they are still human, a shot to the heart can kill one... as can loss of blood and other things...
Zombies... well they are slow, have only the physical abilities of the human that they once were, and their brain has only one functional thought... eat human flesh.
But they feel no pain... at all. And they can only be killed in one fashion... destroying the brain.
In a long term, massive battle... the zombies would win.
They never starve... and the only way they die from not having the brain destroyed is decomposition which could take years...
Infected could die of starvation, or other ailments.