Nigeria vs South Africa

Nigeria has no monthly cost data yet; South Africa's $1,294/mo monthly cost (across 4 scored cities) — not enough data to call a winner.

Nigeria has no safety score data yet; South Africa's 0.8/5 safety score (across 4 scored cities) — not enough data to call a winner.

Nigeria has no mobility score data yet; South Africa's 2.1/5 mobility score (across 4 scored cities) — not enough data to call a winner.

Nigeria has no culture score data yet; South Africa's 3.4/5 culture score (across 4 scored cities) — not enough data to call a winner.

Nigeria's passport reaches 25 destinations visa-free to South Africa's 65 — South Africa 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, South Africa is better connected — 38M passengers/yr vs 13M passengers/yr. Nigeria is quieter than 54 of 87 countries worldwide; South Africa is busier than 50 of 87 countries worldwide. Nigeria sees ~7 air passengers per 100 residents a year; South Africa sees ~65 air passengers per 100 residents a year — a derived figure, not itself ranked.

Nigeria runs 21°C to 40°C for most people; South Africa runs -2°C to 33°C for most people. Katsina runs colder, at 6°C. Depends on you — which range fits your tolerance is the real question here, not a score.