You would have to test it yourself. Generally, you will pay less combined tax by filing one joint return instead of two separate returns. However, if you currently qualify for Earned Income Credit, your husband's earnings could disqualify you. Depending on the type of survivor benefits you receive for your children, you might pay more tax on them if your combined income is high enough. (Unless the income is in the children's name, then it is not taxable unless they earn money and file a return.)
The only real way to know is to prepare test returns in both scenarios.
