Tax andPRSI/health levy free (e.g. up to 47% relief for a high rate taxpayer).
Growth on the fund is tax free - on a non pension unit linked fund it would be subject to 23% exit tax and on shares it would be subject tot 20% CGT.
Ability to take 25% of your pension savings as a tax free lump sum at retirement.
Pension income would be assessable for income tax whereas capital gains from other investments would not (once CGT is paid).