Belgium vs Luxembourg

Belgium's $2,622/mo monthly cost (across 6 scored cities); Luxembourg has no monthly cost data yet — not enough data to call a winner.

Belgium's 3.2/5 safety score (across 6 scored cities); Luxembourg's 4.7/5 safety score (across 1 scored city) — not enough data to call a winner.

Belgium's 3.1/5 mobility score (across 6 scored cities); Luxembourg's 3.2/5 mobility score (across 1 scored city) — not enough data to call a winner.

Belgium's 3.7/5 culture score (across 6 scored cities); Luxembourg's 3.5/5 culture score (across 1 scored city) — not enough data to call a winner.

Belgium's passport reaches 106 destinations visa-free to Luxembourg's 103 — Belgium 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, Belgium is better connected — 34M passengers/yr vs 5.3M passengers/yr. Belgium is busier than 44 of 87 countries worldwide; Luxembourg is quieter than 71 of 87 countries worldwide. Belgium sees ~3 air passengers per resident a year; Luxembourg sees ~9 air passengers per resident a year — a derived figure, not itself ranked.

Belgium runs -13°C to 30°C for most people; Luxembourg runs -13°C to 31°C for most people. Depends on you — which range fits your tolerance is the real question here, not a score.