Chapter 19, Problem 19.20P

Two other commonly used sulfonic acids are methanesulfonic acid $\left({\text{CH}}_{\text{3}}{\text{SO}}_{\text{3}}\text{H}\right)$ and trifluoromethanesulfonic acid $\left({\text{CF}}_{\text{3}}{\text{SO}}_{\text{3}}\text{H}\right)$. Which has the weaker conjugate base? Which conjugate base is the better leaving group? Which of these acids has the higher $\text{p}{K}_{\text{a}}$?