Hello from another Rina. I prefer the high contrast version, and I think it's much easier to make that work as floors that are too similar in depth can risk clashing rather than blending. But I don't think there's a rule, as such. I can imagine situations where a high contrast might break up the space too much.

Don't talk about them.

My pleasure, Rina.

If the floors are nice and even I say dark if there is a lip to it then for awareness I say light , you never know who comes into your house and trips over a raised threshold and takes a tumble ,think of old age :)