heh, it's cool but I don't think it's balanced quite right, on both sides.
The whitestars should obliterate the federation ships with practically no loses, given how advanced they are.
And the federation ships should obliterate the EarthForce ships with practically no loses, given EarthForce ships are pretty low tech.
Thought I guess that might not make it all that interesting.
Because of the very different technologies, it's hard to compare. I think the whitestar fleet would fire at a federation flagship, and the tactical would say: Shields down to 99.5%.
Shields do cause a problem when making comparisons.
Shields do exist in the Babaylon5 universe. The very old 'thirdspace' artifact that was made by the Vorlon's had shields.
The fact that the tech exists but current Vorlons ships don't have shields points to shields not being all that beneficial. They have said a few times that the hulls can absorb most of the energy from energy based weapons instead.
My reasoning for the Whitestar ship extreme combat ability was due to the ships being manufactured in conjunction with tech from the Vorlon's who are millions of years old as a race. And that the Whitestar could, at a pinch, destroy a shadow ship that is also build bit a race millions of years old.
There is precedent of very old very powerful races in StarTrek that would totally out class any common alpha quadrant race. The Voth empire from Voyager comes to mind. Which is sort of like how I would see the tech in the Whitestar. Very advanced compared to everything else.
One argument in the other direction is that since Babylon5 has no form of matter transporter it open the way for devastating damage using that to deploy weapons without any shields to block it.