Solid Hardwood, Engineered and Laminate Flooring - Raising a floor

I am converting an enclosed porch (7x14ft) off my 14th floor condo livingroom and the concrete floor is 5.5in lower than the livingroom floor. I would like to make the floor flush with the livingroom floor so I need to elevate it. I believe there is minimal moisture. What is the best material to elevate this floor (treated wood/plastic or aluminum material?)????

Moisture test should be done on concrete. Concrete can be sealed. Vapor retarder will be required to cover concrete before installing your sleeper system for subfloor installation. If subfloor is not going to be exposed to moisture, then untreated or treated wood is your choice. If installing solid hardwood, you will need a 3/4" plywood (OSB acceptable) subfloor for nailing. Or, you can float in an engineered wood floor or plastic laminate. If you select tile, you will need at least 1/2" concrete underlayment board.

Thanks for the reply. Excuse my ignorance I am new to finishing a room like this but how does one perform a moisture test anyhow? As far as I understand it a vapor protection is simply a sheet of plastic laid over the concrete floor or wall prior to placing the subfloor or wood straps on a wall over masonry. The floor of this patio is concrete and 3 of the 4 walls are ceramic or regular brick.
Wood sounds like a good option for it.
Thanks