It depends 100% on your budget. If money is no object there are many Custom rigs that can carry payloads, multiple sensors etc but you could easily spend $50K in a blink of an eye.
At the same time if you have a fairly tight budget ANY sUAS is better than none. The M2ED is a good starting point but we've used Phantom3, Phantom4, Mavic Paltinum, Yuneec H520, Matrice 200/210's and then custom.
When we help set up a new Dept program we take their initial budget and cut it in half. That 1/2 covers the initial aircraft system purchase and the other half is for everything you need (Case, Chargers, Props, Batteries, LEDs, wigdets etc).