The box one has a very bad cooling solution and probably bad fets. I tried it on my e bike and it pretty much overhead after one acceleration at 100A
The flat one has big fets comparable to the Raiden7 the whole pcb has great thermal contact with the metal case so it’s easy to attach additional heatsinks. I Put it in a metal box for optimal cooling and it stays surprisingly cool with 150A motor current. The absolute maximum current is factory set to 220A so I may go up to 160A or 170A until I get cutouts.
I would not recommend anyone buying the one in a box unless you are fine with like 30A
It’s WAY better I have 2 of those trampa VESC6 in my mountainboard and this single one has probably double the power if you are using it at 20s