Chainsaw Repair

I also noticed that in your first schematic at the end of your video you use a SCR to discharge the capacitor into the ignition coil.
On your second schematic you use two transistors to discharge the capacitor into the ignition coil.

Just two different ways to do the same thing or is there a reason that one is preferred over the other due to reliability or something else.

Also the first one looks to be much more simple in design than the second one.