Nigeria vs Tanzania

Nigeria has no monthly cost data yet; Tanzania has no monthly cost data yet — not enough data to call a winner.

Nigeria has no safety score data yet; Tanzania has no safety score data yet — not enough data to call a winner.

Nigeria has no mobility score data yet; Tanzania has no mobility score data yet — not enough data to call a winner.

Nigeria has no culture score data yet; Tanzania has no culture score data yet — not enough data to call a winner.

Nigeria's passport reaches 25 destinations visa-free to Tanzania's 47 — Tanzania 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.

Nigeria is better connected: 13M passengers/yr against Tanzania's 5.7M passengers/yr. Nigeria is quieter than 54 of 87 countries worldwide; Tanzania is quieter than 70 of 87 countries worldwide. Nigeria sees ~7 air passengers per 100 residents a year; Tanzania sees ~10 air passengers per 100 residents a year — a derived figure, not itself ranked.

Nigeria runs 21°C to 40°C for most people; Tanzania runs 16°C to 36°C for most people. Katsina runs colder, at 6°C; Mafinga runs colder, at 1°C. Depends on you — which range fits your tolerance is the real question here, not a score.