If someone else, like your spouse or adult child, owns a policy on your life and dies first, the cash/termination value will be in his/her taxable estate. That doesn’t help much.
But, more importantly, if someone else owns the policy, you lose control. This person could change the beneficiary, take the cash value, or even cancel the policy, leaving you with no insurance. You may trust this person now, but you could have problems later on. The policy could even be garnished to help satisfy the other person’s creditors. An insurance trust is safer; it lets you reduce estate taxes and keep control.