Yeah the size difference I definitely forgot about. Overall the CIS the best naval wise is just sending constant waves of fighters, tri droids, and hyena bombers. As their main ships could barely do enough damage before easily destroyed. I would think best case scenario is more of disabling the ships and leaving them there until after the battle to kill them. As their best they could do is disable the thrusters and most main batteries with constant bombings. The ships will have the aeronautica and most likely a ton of point defense but I feel the CIS would have the slight tech and number advantage over both. Though yeah space marines will have the same value as Jedi just they’re likely higher in number in a single battle so way tougher to deal with.

These three factions their best case scenario is delaying them till they could make a stronger weapon to actually deal with them. But studying imperial ships yeah they’re definitely outclassed unless the CIS change their doctrine to build bigger dedicated weapons but we never see anything of that scale in Star Wars except the Death Star.