Snes9x hires blending: merge vs blur

Can someone please tell me what the difference is? Kirby’s Dream Land 3 uses these vertical lines to make transparency happen. So I turn on hires blending. But there are two options: merge and blur. So I have two questions:

  1. What’s the difference?
  2. Should I be using one over the other and why?

Been discussing this in a feature request I made to add the merge option to bsnes:

I think the merge option looks cleaner overall and more consistent than the blur one. But you can pick whichever you think looks better.

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