Personally I do not see the need to make comparisons as such - its all apples and pears, whatever suits your palate personally, go for it.
There are plenty of fine 8 - 12yo Scottish malts, or indeed 15yo. Most have very little in common with the whiskey in question, Redbreast.
Redbreast whiskeys are to my taste palate perhaps the most enjoyable irish tipple, along with a few Bushmills releases. They are unquestionably Irish in their character, and I adore that orange marmalade flavour that hits late in the taste. The 15yo is a more powerful of the two and at 46% benefits from added water in my opinion, allowing it to properly open up on the palate.
As to the Scottish whisky, fine 12yo malts to my liking include Balvenie, Highland Park, Lagavulin, Caol Ila, Glenfarclas..the list goes on. Needless to say, I am happy to enjoy both fine Irish whiskeys and Scottish whiskies!