Oil vs Epoxy coils.....

In all my bla-bla I forgot to look at the coils in question, sorry. The first coil is a $20 coil with a $14 sticker saying Pertronix.
The second is unkown, they seem to leave out specs.
Coils rarely fail. If your original sparks blue, it might be better and more reliable than either.
Do you know who sells these $20 coils (40000 volts/1.5 ohm) without the 14 dollar sticker?
And why this kit states only to use this coil. Not the Accel, MSD or Mallory coil.
FBO Ignition Systems