I never tried that opening, so that's why I assumed you wanted to say the Detonate antimatter stuff, but maybe sometime I will try and see how it turns out, the focus fire of Radiance.
To be clear, you want to pick the Radiance as your lead because it has detonate AM (very useful against MB)...but, when going against an Orky early game it is going to be slightly better than the prog because of the better focus firing (not because of DA)...
Now, I say that primarily because 1) most early Orky rushes don't have lots of frigate support so malice won't help too much and 2) I usually pick fighters over bombers for my squadron on the prog...if you were to pick a bomber squadron though on the prog, then it would probably do more damage than the radiance while at lvl 1 (though once the radiance gets it's own squadron at lvl 2, it would be favored again)....