Ethiopia vs Nigeria

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

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

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

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

Ethiopia's passport reaches 13 destinations visa-free to Nigeria's 25 — Nigeria 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 than Ethiopia — 13M passengers/yr vs 13M passengers/yr. Ethiopia is quieter than 57 of 87 countries worldwide; Nigeria is quieter than 54 of 87 countries worldwide. Ethiopia sees ~12 air passengers per 100 residents a year; Nigeria sees ~7 air passengers per 100 residents a year — a derived figure, not itself ranked.

Ethiopia runs 8°C to 30°C for most people; Nigeria runs 21°C to 40°C for most people. Gambēla runs hotter, at 43°C; Katsina runs colder, at 6°C. Depends on you — which range fits your tolerance is the real question here, not a score.