Play the Hiwatt (just want to hear what it sounds like. Usually Hiwatts are pretty harsh and freaking loud standing in front of them. Not the #1 keeper sound.)
Keep the Marshall. (could use this all day, every day, twice on Sunday.)
The VOX deserves a campfire, but chipper will do. There's an Aclaim Dr. Robert pedal that makes this sound, so the remaining 7 amps in existence are not needed.
...and just because there's a photo of someone using an amp, that doesn't tell you how often they used it and what other gear around it was required to get those classic sounds.
FWIW Pete Townshend's Hiwatt was actually different. His had 4 gain stages with separate volumes on the front and only bass/treble for tone, no presence or mids. You can still get his sound with a standard DR103, just working the settings and optionally using all 4 inputs in various combinations. I believe the Gilmour version was designed to slave additional power amps from the main one. But I think the Page and Gilmour versions are very close if not the same audio signal circuit. I think both Pete's and Gilmour's owed some of the circuit design to Hiwatt P.A. models, Pete's with the multiple input gains, and Gilmours with the slave out to chain other power amps.