Ireland vs United Kingdom

Between the two, United Kingdom is cheaper — $2,247/mo vs $2,616/mo. Ireland is pricier than 35 of 41 European countries; United Kingdom is pricier than 31 of 41 European countries.

Between the two, Ireland is safer — 2.7/5 vs 2.6/5. Ireland is less safe than 25 of 41 European countries; United Kingdom is less safe than 27 of 41 European countries.

Between the two, United Kingdom scores higher on mobility — 3.4/5 vs 2.7/5. Ireland is harder to get around than 29 of 41 European countries; United Kingdom is easier to get around than 31 of 41 European countries.

Between the two, United Kingdom scores higher on culture — 4.3/5 vs 3.9/5. Ireland is richer in culture than 34 of 41 European countries; United Kingdom is richer in culture than 40 of 41 European countries.

Ireland's passport reaches 104 destinations visa-free to United Kingdom's 126 — United Kingdom opens more doors without a visa. Passport strength shifts over years of naturalisation, not months of planning, so it's a long-horizon footnote — not scored in the tally.

Between the two, United Kingdom is better connected — 287M passengers/yr vs 42M passengers/yr. Ireland is busier than 53 of 87 countries worldwide; United Kingdom is busier than 81 of 87 countries worldwide. Ireland sees ~9 air passengers per resident a year; United Kingdom sees ~4 air passengers per resident a year — a derived figure, not itself ranked.

Ireland runs -13°C to 23°C for most people; the United Kingdom runs -14°C to 25°C for most people. Depends on you — which range fits your tolerance is the real question here, not a score.