Bosses order do not really matter, you shouldn't be farming those.
And getting 100 cards in 1 zone is better than 50 cards in 2 zones (80 vs 36x2 damage), so it's probably telling you to go for the one with 10 as it's closer to 100 than the one with 0 because it's thinking "long" term.
And getting 100 cards in 1 zone is better than 50 cards in 2 zones (80 vs 36x2 damage), so it's probably telling you to go for the one with 10 as it's closer to 100 than the one with 0 because it's thinking "long" term.