Which Do You Prefer From A Sequel— Innovation or Refinement?

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If I absolutely had to choose just one, then I'd have to go with innovation just for the sake of keeping things fresh, as it sucks when a series gets stuck in a rut and starts to feel stale.

Some of my favourite games are innovative sequels; Resident Evil 4, Super Mario Galaxy, Breath of the Wild...

I do also appreciate refinement though when done right.