Savage for me. I bought the discounted 45th anniversary bundle featuring the collected editions of all the stories featured in prog 2. Reading Invasion in that format really brought home to me how repetitive the stories were. They started to introduce some series arcs later on, but initially it was always the same plot: the Volgs would unveil some new weapon or vehicle, Bill Savage would storm in with his resistance fighters, say something cockernee, then blow it up. Rinse and repeat. Savage at least tried to add some depth to the character.