Solid hardwood. The right choice above grade in most Worcester County homes, and it can be refinished multiple times over its life. It moves with seasonal humidity, which in Massachusetts swings hard between a humid August and a dry heated January, so it needs to acclimate in the house before installation and needs proper expansion gaps at the perimeter. Skipping acclimation is why floors cup and gap.
Engineered hardwood. Real wood veneer over a dimensionally stable core. It handles humidity swings and radiant heat better than solid, which makes it the better answer over concrete slabs, in basements with a good moisture picture, and anywhere with in-floor heat. The tradeoff is a limited number of refinishes depending on wear layer thickness.
Tile and natural stone. Porcelain, ceramic, and natural stone, in kitchens, bathrooms, mudrooms, and entries. Subject to everything in Section 2 about deflection.
Luxury vinyl plank and tile. Waterproof, dimensionally stable, and genuinely good now in a way the category was not fifteen years ago. It is the default for basements and a reasonable choice for mudrooms, laundries, and rentals.
Refinishing existing hardwood. Frequently the best value in an older home. Original wide-plank pine and old-growth oak are better material than anything currently sold, and if there is enough thickness above the tongue to sand, refinishing costs less than replacement and preserves something you cannot buy back.