choke wiring again

Ok so I did a search and saw the previous responses on this. My car is now a bit different then stock. I have a pertronics style electronic conversion so my ballast resistor has a shunt so the coil gets 12v all the time. I also have the alternator wired normal 1968 with one field but there is an unused spade terminal on the back. I would like to use either the coil + or that unused alternator terminal for simplicity. Is one better then the other or are they both unacceptible?