Yes. In most cases, you and your spouse will need separate Wills. You may have separate assets and you likely will not die at the same time. In addition, some states do not support "Joint Wills." If you happen to die at the same time, both Wills will go into probate.
Separate Wills give you the opportunity to address issues such as:
Children from previous relationships
Sentimental family property that you may want to leave to someone other than your spouse
To assure that your children will inherit certain assets rather than your spouse's children or your spouse's future spouse
The distribution of business assets
Leaving too many assets to an elderly spouse, making it difficult for them to receive benefits