Oman vs Yemen

Oman has no monthly cost data yet; Yemen has no monthly cost data yet — not enough data to call a winner.

Oman has no safety score data yet; Yemen has no safety score data yet — not enough data to call a winner.

Oman has no mobility score data yet; Yemen has no mobility score data yet — not enough data to call a winner.

Oman has no culture score data yet; Yemen has no culture score data yet — not enough data to call a winner.

Oman's passport reaches 44 destinations visa-free to Yemen's 7 — Oman 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.

Oman's 13M passengers/yr annual passenger volume (across 1 scored city); Yemen has no annual passenger volume data yet — not enough data to call a winner.

Oman runs 10°C to 46°C for most people; Yemen runs 11°C to 34°C for most people. Aden runs hotter, at 45°C. Depends on you — which range fits your tolerance is the real question here, not a score.