There are many grades of caulk. Cheap painter's caulk can start to shrink after a few years, and yield less than optimum results. One of my sons works for a high-end contractor who uses Sashco's Big Stretch caulk, which shrinks less than many brands. The difference in cost is meaningless, if you don't have to go back and supply much more expensive labor to eat a warranty problem.
Steven- Random Orbital Nailer