Weapon of coice for glassing a homeworld?

[Suicide Junkie]

Drop Wp altogether, I don't like them, that's not SciFi as I want it

At the very least, you should be leaving them in as armor for the population. IE: Bomb Shelters & Bunkers.
Surface - to - Space Missiles are also quite reasonable, and certain types of direct-fire weapons too (torpedoes, lightning gun).

Antiproton beams should certainly never be used in any sort of atmosphere