I'm not sure which country has the better golf. But I doubt there's a huge amount in it, and whichever country you go to, you'll be sure to enjoy yourself. Those who say they prefer Ireland are obviously correct and those who say they prefer Scotland are also correct.
I don't have experience playing golf in Scotland - been to St Andrews. I love the look of the manicured Scottish courses, with the well-defined bunkers, burns etc. I see them as being a bit like Portmarnock, generalising things.
Again, I could be wrong, but Irish golf seems to be something different. It seems to be a bit more wild - not always as subtile as Scottish links golf. Maybe a bit more of a rush. But you'd have to like that kind of thing to appreciate it. I'm very happy to have Enniscrone as a second tier course. I'd play there ahead of just about anywhere. Brilliant golf, in my opinion. Fun, challenging, relaxed... Irish golf seems to be more wild rides up, over and between the dunes. I love that. Don't know the architectural merit.
Anyway, what I'm getting at is that one cannot be said to be definitively better than the other, as they seem to be different. They have different personalities. And even if it was the case that Ireland comes second to Scotland (or even behind England) in terms of this kind of golf, sure I'd be happy enough with that. You can't go wrong either way.
John