I for one prefer the Amiga version, because that's what I played back in the day. The Amiga supported 32 colors (without tricks like EHB and HAM) in 320x200/240 mode, so only twice as much as EGA, but they could be picked freely from a palette of 4096 colors, so IMHO it looked much better than the EGA version with its fixed 16 colors. But if you look at screenshots (https://scummbar.com/game/the-secret-of-monkey-island/versio...) it's obvious that they really put in a lot of work, with custom assets which fully used the capabilities of the various platforms. Of course, the higher the limitations, the more artistry was needed to make it look reasonably good, but I don't think that should be held against the "higher-color" versions...
For a game like that, while I agree with the Amiga version looks good, frankly the Amiga port still feels like a good example of why there were lots of complaints about "lazy" ports for the Amiga that didn't take proper advantage of what it could do.
For a relatively static display like that EHB would've not been a problem, and the amount of gradual changes would've made it easy to exploit in the palette. Using the copper to modify the palette a few places would've also allowed for more, and switching to 640x200 below the graphics to make the text smoother would've been outright trivial. Even HAM might've been reasonably feasible.
I was going to say this. I never liked the 256-color VGA game (and now comparing, it does look bland) but Amiga struck the best, IMHO, balance between good hand-crafted pixel art but with realistic enough colors to give sufficient depth and athmosphere in the scene.