So in my questions about the intergalactic highway and simulated ship quarters I established a universe where the navy fights a cult of alien worshipers over star gates. 500 to 700 years in the future. I want the navy to have a “super weapon” that they can use to attack the cult’s heavily defended world. My ideas are:
Planet cracking railgun
This gun is mounted on the brand new UHFS Cayuga. The gun will be able to accelerate a massive shielded projectile to near c while it is going down the barrel. I want the gun to shear continents into pieces and destroy the cult’s bunkers and cities.
10,000 megaton bombardment nuke
This is also mounted on the new ship. It would be used to destroy the cult cities.
Which is more realistic and effective? A question will follow regarding the details of the battle and the tactical situation.