I think the principal advantage is if you want to contribute more than what the tax break allowances allow on a personal basis, then you can get the tax break on this, via reducing your corporate tax bill. So for example, if you are 30-39 you get a tax break of 20% of your salary, so say you earned EUR40,000 as salary you could 8,000 so as to fully avail of your tax break.
But if you wanted to contribute more than EUR8,000, [say 18,000] then if you contribute on a personal basis, you don't get the tax break on the excess [10,000]. So for this larger amount, you might make it [18,000] as a company contribution and you can write this off your corporate tax by reducing your profit for the year, so there's no limit on this (versus the limit on personal contribution).
As ever, you should double check this with your pension provider / accountant - anyone else know about/verify this?