Fast growing trees are often short-lived when compared to slow growers. Some fast growers like the Princess Tree grows quickly but can be invasive in many areas. The decision on what kind of tree to plant depends on many things such as soil type, location (you don't want roots growing too close to your house), moisture, whether you have acid or alkaline soil, and size at maturity.
Louisiana lies in several plant zones. Check out the US Plant Zone Map to understand your plant zone. Call your local agricultural extension service or check them out online for helpful information.
Natchez Crepe Myrtle grows rather quickly, has beautiful exfoliating bark, and produces flowers. It reaches 39 feet at maturity and grows in US Plant Zones 7 - 9.