What are the advantages and disadvantages of using sulfuric acid instead of phosphorus acid

what are the advantages and disadvantages of using sulfuric acid instead of phosphorus acid in dehydration reaction of alcohol?
please help

Disadvantages: Sulfuric acid can form a reaction with alcohols to give dialkyl sulfates which is undesirable. Plus sulfuric aicd is more reactive than phosphoric acid resulting in the reaction with the other components of the reactants.