The question and answer are both useless without context. What is your current tax bracket? What is your expected future highest tax bracket? What is your expected tax bracket upon retirement? Do you already own a home, or are you saving up for a down payment on a home, or have you taken a pledge of lifetime non-home-ownership?

From the point of view of having a saving discipline, I would prefer a TFSA.  "I like the deduction for the RSP contribution because I get a nice tax refund." I am not impressed that you need to be bribed and are oly thining short-term.