I am assuming you want to drop in Algeria anyway.
Remember Algeria costs the Axis $6 though, which is why 3 trn into Alg each turn with another 2 trn ($14) swapping into SZ12 & 23.
The added flexibility is that in a pinch you can dump 10 troops into Algeria of Congo if required.
But yea, if you are running KJF, then Brazil would be better I guess (but less flexible as all you can really do is shuck into SZ23).
I normally run 60% KJF 40% KIF, which makes spending around $20 a turn on 5 dudes and a tank good, with the little shuck into Congo.
And if Japan ever takes it’s foot off the gas I can spend around $30-$35 getting enough to fill 4-5 trn in the Atlantic.