Where is your flooring being installed - Are you able to nail your floor to a plywood subfloor? Are you installing your flooring in a basement or high-moisture area of your home?
Foot traffic - Is your flooring being installed in a high-traffic area which may need to be sanded and refinished in the future?
Floor finish - Do you want to finish your floor on-site with your own finish or do you want to install prefinished flooring?