No matter how you arrange the first 3 runners in a relay race, the 4th (a.k.a. the anchor) should always be the best. Think of your fulfillment partner as that 4th leg in your race to market. As the anchor of your team, they must be the strongest and fastest.
Be very selective when choosing who will manage your fulfillment. It’s not as simple as putting product in a box and loading it on a truck. It’s about finding a company with: