Having a 3rd recovery winding gives you the ability to do things that the SSG (diode picking off the spike from the collector - really, collecting spike from the coil is a better way to look at it)...won't do. Isolated windings you can do things you can't by picking the spike of the same winding.

Yes, use one or the other.

Bedini Capacitive Discharge Chargers
Bedini Capacitive Discharge Chargers

I highly recommend that anyone try using MECHANICAL SWITCH with points/contacts. You will get gains that are not available with solid state switches.

Charge the cap bank, discharge with mechanical switch to output batts.
That dual battery charger schematic shows the concept and I show you two versions I did.

The BEST results I ever got were with the bicycle wheel one, 2000 turn trifilar, charging 198,000 uf to 2-4 volts above the dead battery...you of course have to adjust the pulley diameter in order to have it trigger at that based on how long it takes to charge the caps.

That thread I posted 2 links to above might be a better thread to discuss this instead of the regular SG thread but whatever works.