Is the main difference one can only be refinished once?
It sounds like you're in the very early stages of looking at wood floors. The number of times an engineered hardwood can be refinished depends largely on the surface wear layer. Laminate floors are not real wood but rather made up of composites that resist scratching.
Harder the wood? That's always a tug of war with many new floor owners. Don't let anyone convince you harder is better. Recommendation?
Try these links...and get back with us.http://www.hardwoodinstaller.com/prepar ... rdness.htm
- see the information below the hardness chart. It may open your eyes a bit.http://www.hardwoodinstaller.com/preparation/types.htm