I don't see why one choice should be better than the other. Both give up the regulation provided by the 3TF7, but most agree that it works well without it. Incidentally, the two oscillator tubes are 6BA6s, to be replaced by 12BA6s if you choose. I've been using a resistor for about 20 years now, but am saving two 3TF7s to cash in when i retire. Ed WB2LHI