Ireland and Spain are two of the countries people most often shortlist together when moving to the EU. Below is an honest side-by-side on the things that shape daily life, with the stronger country marked on each row. On these measures Ireland comes out ahead on 5, Spain on 6.
Rent is the clearest split: a one-bed runs about EUR 1,700 a month in Ireland against EUR 1,000 in Spain, so Spain saves you roughly EUR 700 every month.
Typical net pay is EUR 2,800 a month in Ireland and EUR 1,600 in Spain, putting Ireland EUR 1,200 ahead before anything else is counted.
What actually matters is the money left after rent: EUR 1,100 in Ireland against EUR 600 in Spain, which is where Ireland pulls ahead.
On paperwork, citizenship takes about 5 years from arrival in Ireland and 10 in Spain, a 5-year head start for Ireland.
You will get further on English alone in Ireland than in Spain, which matters most in the first year, before the local language clicks.
The weather is not the same trade either: Ireland is mild, Spain is warm.