Are Cassadors better than Skims in range battle?

When I play game, Usually end in 3age.

And when I calculate Cassadors are almost same Skims in range battle in 3age.

​

For example, Cassador can kill Skims by 12hit (144/18/0.7 = 11.4), and Skims also can kill by 12hit (110/18/0.55 = 11.1).

​

Then 'Cassadors can fight better than Skims in range battle' means in late game? like treaty?

Or is there any mistake my calculation?