Bluestone
The default for patios and walks here, and for good reason: it is dense, it takes freeze-thaw well, and it sits comfortably next to a hundred years of existing stonework. Thermal-finish gives an even, slightly textured surface that stays grippy when wet; natural cleft is the split face, more variation, more relief underfoot. We use full-thickness stone on sand-set work because inch-and-a-half bluestone stays put where thin veneer-cut stone rocks and cracks.
Fieldstone
What the glaciers left in every yard north of White Plains, and what the old walls are made of. We use it dry-laid for walls and borders where mortar would look wrong against the property.
Granite cobble and Belgian block
The abuse jobs: driveway aprons, curbing, edging that a plow will eventually meet. Harder than bluestone, nearly indestructible in the ground.
Stone veneer
Dresses concrete: foundations, chimney faces, poured walls that need to read as masonry. The skill is in the pattern and the joints, so the veneer reads as structure rather than wallpaper.