They are all good, once you learn how to best use them. I didn't always think so, only one I liked was the Pz. 38H but that is down to being easy to understand, was so much fun when people got the T7 car. recently.
A-32 suffers a bit from low pen atm so depends on your team keeping the reds busy. Pz.38H bounces shots like crazy (I've had 200+ bounce games), Locust shines once the battle lines form up due to good RoF and speed to get out when they notice you. A-32 makes tanks go boom and then runs to a new spot.
Was a good purchase as I had only been playing a few months.