Tosyl Chloride? why not anything else
Part of the reason why p-tosyl chloride is seen so often is not only the ease of its preparation, yet that is a side product in the preparation of o-tosyl chloride towards saccharin.  Ease in storage and addition / use are beneficial.  While a p-nosyl chloride eventually may yield a better nucleofuge than the p-tosyl chloride, the very same nitrogroup may ease the hydrolysis of the chloride as well.