Wish to install something durable that will last at least 5+ years.

In terms of maintenance costs and durability, how do flat roofs compare to pitched roofs here in Austin?

They need to be secure, durable, and weatherproof.

They will look brand new and are a very effective way of handling flooring...ALWAYS use the hardwood when it is there unless really damaged and even then try to save it, very durable and people LOVE it.  

What's your thoughts about cost and durability?

Unless your tenant is very high end for the rental market then you need items that take abuse and are durable for a long time.Also at play is if the contractor specializes in redoing bathrooms etc.

Wood is usually pretty durable, and a lot of people prefer it. 

Ditto what others have said about the durability of the older materials and fixtures.In general, renters are less picky than buyers.

I came across a company close to me that for a flat fee of $2,500 they advise for income tax, estate and gift tax planning,  document preparation for pour-over wills, revocable living trust, durable power of attorney, living wills, assignment of personal property, quitclaim deed, and LLC.This flat fee is for life and I can ask questions and sit down and talk as much as I want.  

It is a little more expensive but much more durable.