It would not be recommended that you mix two different pesticides, whether it is a termiticide and an insecticide, two different insecticides, fungicide and insecticide, etc. Because of the different chemical make up, possibilities of unwanted or chemical reactions may occur.
There are many different insecticides you can use for general perimeter control of your home. I would not necessary say one is stronger or better than another.
Different chemicals contain different main active ingredients and different percentage of each ingredient.