Tile, it doesn’t get ruined. If you want, you can put down some area rugs to stage the place, get a cozy affect.
If you can, put in a French drain — at minimum a sump pump. If I walked into a basement and there was no sump pump, I’d just think, “Damn, now I have to dig up all this tile to put in a pump.” Not horrible, but I’d adjust my price. I’d also wonder how much mold was growing behind the walls, given there was no pump.