Star wars fleet V.S imperium fleet.
Here are the final arguments, I'd like to point out that lances are laser weapons.. And that mean, that if star wars ship are equipped with advanced magnetic hull shielding, the laser shot are going to bounce of the target with a 100% chance.
And lances are the only longue range engagement weapon that the imperium have.
Then they have macro canon, that are just big kinetic canon that work with canon powder, but they can fire all sort of nasty projectiles, but nothing to worry about, unless it is some plasma macro canon, but this is "ancient technology" like you good old toaster the adeptus mechannicus is not able to produce them anymore...
The projectile are slow enough to be destroy via some anti missile laser system or point defense system.
Then there is the nova canon of **** YOU BIATCH, a giant over powered rail gun that fire bombs at the speed of lights extremly deadly and powerfull but also higly innacurate du to a clear lack of tactical cogitator and an over reliance on semi sentient servitor. Cuz Grimdark.
Star wars ship are maybe slower than 40K ship but they also have a lower profile and are made for actual combat, I mean they are not churches in space. So they still have some 25% chance to don't get hit at midrange engagement and can survive a hit, An acclamator can survive only one hit but it will be still half functional.
Then they have their torpedo, well they are not going to hit any star wars ship soon.... except the vortex torpedos, but like all vortex weaponnary, it is "ancient technology". Fortunatly because those weapon can destroy an entire fleet in one shot.
There is all they bomb stuff that they can teleport via warp technology but warp etchnology is a bbit let's say random... They have bomb that destroy the shield, they have magna and plasma bombs, and tsasis bombs...
They have also gravitational weaponnary, but it is ancient technology, so do not worry about it.
They have plasma weaponnary, super powerfull and slow, but your know not really safe to use because there is a 10% chance to blow-up the ship by attemptimg to shoot with those, because grim dark, they either fight with flash light or they iether play russian roulette...
https://1d4chan.org/images/b/ba/Warhammer_Plasma.jpg
They have also some melting weaponnaory, it work a bit like the geonosian weapon in republic commando...
They fighter are big tough and not manoeuvrable, their bombers have some deadly rocket pod, but can only carry one torpedo, cuz te imperium cannot make an effective weapon that is not as big as your dick (within your imagination you dick is a way to mesure giant things.) One they fire they have to reload, they just cannot really zerg rush and nva flare the **** of everything they encounter like in star wars.
They also have some flak canons, the emperium is quite good at making ground auto-canon, but your see in space they are as worth as a world war II anti air gun emplacement on a battle ship.. except they have advanced targeting system.. But it is not a big deal... Just focus on using vulture droïds rather than x-wing and it will be fine.
Their ship are big and fast and are eqquipped with void shield, that are powerfull warp powered shield, but they are buble shield, even worse, any projectile that go under a certain speed can just go and ignore the void shield. Attack from behind Will guarantee and high chance of shield penetration, givene that star wars ship can go hyper space at will, and get behind them...
They cannot dodge all of the turbolaser bolt, they ship are too big for this.
+ The warhammer fan will claim that they win via boarding, but not every imperial battle ship carry adeptus astartes, so it will be likely the imperial guard assaulting the ship, rather than dude in terminator armor.
Compare to necrons chaos and eldar fleet the imperial fleet is just laughable.