A significant advantage of a trust, other than avoiding/minimizing probate, is that it is (or can be drafted to be) much more difficult to contest than a will in a probate proceeding.
Another significant advantage of trusts for largish estates is their use in minimizing estate taxes by fully utilizing each spouse's unified gift/estate tax credit in the face of the unlimited marital deduction.
See a competent trust and estates lawyer. This is not an area to trust to Nolo or legalzoom.