Deleted member 1487
A Wespe probably would be a game changer if they could keep it supplied.My vote goes in for the Panzer I *and it's derivative, the 15 cm sIG 33 (Sf) auf Panzerkampfwagen I Ausf B (Panzer I Bison). The Panzer I is plenty for the combat of the time, and a self-propelled 15cm gun to support them and follow the infantry on the assault, keeping respectable artillery firepower with them on the go, can't hurt at all.
https://en.wikipedia.org/wiki/Wespe