Single-Ended Triode vs. Pentode: Which Amp Is Best?

I modified one of my single-ended tube amps with switches to toggle between triode and pentode wiring and between with negative feedback and without, respectively. In this video, I do listening tests to compare the two and speak upon some of the differences. I use clips by Boz Scaggs, U2, Incognito, The Sunday Manoa, The Stranglers, and Metallica.