Take a pic of the whole house.
Do you want to whitewash or shmear the stone?

Deck I’d do concrete or composite. And I’d extend it.

Siding - is it in bad shape or you just want a change?
What about whitewash stone with white
Or current stone with black.

The stone we want to keep as is.

Any pros/cons to help pick between concrete or composite? Extend the stairs to the wall?

Siding is in bad shape on other parts of the house, rotting mainly and woodpecker damage

Yes. Just to help visualize. Excuse the mess lol

HU-187528210 thank you, any color suggestions for the deck

For composite I’d go with black or wood look but any color should work