I certainly prefer the idea of an armoured car on the open African terrain but perhaps the tankette would fare better in the jungle? Of course ANY vehicle will have trouble in the jungle, so maybe it's a wash.
An armoured car would have longer range and be more capable of independent operations, so if the Bakers have plenty of support they can probably manage a tankette, but if you imagine they're mostly on their own, an armoured car might be better.