The 2 tactics could work. What I'd do would be a lot like what Darkmark said: go for the expensive unit. The Rebels, if fighting a large Imperial force, would concentrate on attacking the units directly in front of the Death Star. This would make it so the Death Star wouldn't be able to fire on the Rebel capital ships. Instead of fighting larger ships like Star Destroyers and Dreadnaughts, the Rebels would concentrate on anti starfighter ships like Lancer Frigates and Neb-Bs. From there, the Rebel fighters could make an attack on the Death Star by simply out running the Imperial ships. If the Rebel fighters succeeded in destroying the Death Star, they can then hit the Imperial Capital ship's rear flank. The only flaw I can think of is that the Rebel capital ships would have to concentrate fire on small ships at first and hold off all TIEs untill the fighters could complete their mission.