The later games (SW, MH, ESB) were designed for the Amp both in terms of pincushion correction and drawing speed (faster). If the question is whether it will look better on an Amp chassis with std res tube then the answer is no. Quantum (or any vector game) will look better on a higher res tube since the game is drawing everything geometrically as described above (up to the resolution of its DACs). It will just look sharper/smoother/more solid on a medium res tube (as per the video). If you are using an Amplifone chassis it will be able to keep up with the drawing, regardless of whether the tube is std or medium res. Swapping crystals on the MH will be better, I think, since it will be closer to how the game was meant to run. You can tell what you have by tube number or simply by looking very closely at the face of the tube - on std res tubes I can see the three colors of phosphor while a medium res tube they start to blend into a uniform light grey. A standard res tube has fewer but larger dots, while a medium res tube has more, smaller dots closer together. In either case, the tube then determines how sharp the image turns out to be based on its dot pitch, which is the density of the pixels cast into the inside surface of the tube in red, green and blue phosphors. It's 'resolution' is determined by how many gradations the DAC chip on the game board can resolve (ie, 8 bit DAC = 2^8 bits or 1024 resultant analog values). A vector chassis deflects the beam a certain distance away from the center, turns on a color, and deflects to another spot to draw a line from point to point. Raster monitors have a certain number of scan lines (the vertical resolution) and a certain frequency for how many horizontal dots it draws on each line (the horizontal resolution) that are determined by the chassis.
Not sure what you mean by a NARC tube and medium res chassis - a vector chassis does not have a resolution. It has the 12MHz and 10MHz crystals like the dedicated machines. Same board was hooked to each monitor in turn.
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