No one you would manage to make it through to hit a Celestial. A celestial's mass drivers alone would rip a battlecruiser to shreds. In fact, it could gut an entire squadron of battlecruisers with ease. You would end up being dust in the face of my flagship.

And though the big guns may be simpler, the Alliance's missiles are advanced and capable, they can engage well outside the typical range of Imperial warships and while Imperial warships might bite hard when they get within gun-range, a modern alliance Vanguard-Class battlecruiser could probably soften a Empyrean Sovereign enough so that when they get gun-to-gun, the Vanguard could still do its job