I expected the hands to be unbalanced to I thought 4♥ would be better than 3NT, but in fact 3NT would make but 4♥ ended -1.
In 4♥, we would lose the ♥AK, the ♣A and a ruff when the opponents could lead a ♣ the 3rd time, as we couldn't draw trump quick enough.
How would I know that 3NT would be better than 4♥ even if the bidding suggests that the hands will be unbalanced?