Since there was no response to my mooting changes to the 'benefits' list I have made the changes to the Article page. The math proof of the tax benefits is available at the website RetailInvestor.org. The Challenge spreadsheet there deconstructs the benefit. Although Canadian, there is no essential difference between the IRA and RRSP .... contribution is a deduction from taxable income ... no taxes inside account .... withdrawals are taxed as income.
I could not get the URL link to work so do a Google search for "RRSP nitty gritty".