Metal bands use backlines a lot, and borrowed gear. Many bands don't have their own gear because they are playing with 5-6 other bands, or are touring and just use whatever is handy. That means a 410 or a 810 if it isn't going anywhere.
I don't see why 2x 210 would be any different from a 410. Heads and EQ will make a bigger difference.
I don't see why 2x 210 would be any different from a 410. Heads and EQ will make a bigger difference.