I favor new sprites, as long as they are relatively well made. If nothing else, it shows that some effort was put into the game right away, making me less likely to blow it off as another clone of a clone of a clone of a clone of a clone…
My preference goes something like this:
Completely original sprite > Mado edit > RPG Maker default sprite
I prefer Mado edits.
It feels more like a proper continuation f the game universe. I mean yeah, new sprites are nice but the original style is my favorite