Probably quicker conquests. Better? I don't think so.
I dislike playing any horde. Who wants to own the world with 25% of it destroyed?
You should, for starters. Razing gives you the best MP generation in the game, ducats, make it easier to force spawn institutions and rebels weaker. Granted, you are losing dev but that isn't as bad as it sounds when you consider that wrong culture, wrong religion provinces aren't worth much to begin with. To say nothing of the GC you will save by razing.
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