NGK, better by far.

Don't know on the rest. Others will chime in. Fleabay coils probably ok, but you don't know if one's bad until you get in there and see. Testing coils on waste spark engines is different. You have to see both plugs spark at the same time, so you have to clamp two plugs together to make good electrical contact at the threaded area (I use a small hose clamp), put the two wires on the plugs from one coil, and then crank the motor to test that coil for spark.

Not responsible for advice not taken...