What's the practical difference between "latex" and "acrylic" water dispersion paint?
There actually is no difference between latex and acrylic paints because there is no latex in latex paints. Let me explain. All water based paints today are referred to as "latex", even though there is absolutely no latex rubber in the formula. Latex has become a generic label. The stain, water resistance and covering capabilities are achieved by using acrylic resins or vinyl . Better quality paints have more acrylic resins than vinyl.  Paints with a higher percentage of acrylic resin cost more. Vinyl is much cheaper than acrylic and is often used to mix with the acrylic to keep the cost of the paint lower. If you have special needs that may require a superior or better adapted product, the best advise is to go to a professional paint store and discuss your situation with someone that can explain the chemistry and applications of better products.