It is nice to have flowers for beneficial arthropods. That is great if all you want is to look at them. Plants in the mint family are effective.
It is nicer to have a home for these insects, but the cost is that they can bite and sting. Also they need food, so you have to have plants that look a bit scruffy from aphids, caterpillars, whiteflies, thrips, and so forth. Now there is something for the immature stages of the beneficial insects to eat and make more beneficial insect adults. In this broader context you want some plants for flowers and a wide range of plants that provide habitat diversity. You also might think of trying to provide places to build homes. Some wasps build nests in the ground, others under elevated sheltered areas, tree holes, or hollow stems. Paper soda straws work as a good substitute for the latter, or drilling holes in a block of wood.