Saudi Arabia vs Yemen

Saudi Arabia's $1,439/mo monthly cost (across 2 scored cities); Yemen has no monthly cost data yet — not enough data to call a winner.

Saudi Arabia's 3.8/5 safety score (across 2 scored cities); Yemen has no safety score data yet — not enough data to call a winner.

Saudi Arabia's 2.1/5 mobility score (across 2 scored cities); Yemen has no mobility score data yet — not enough data to call a winner.

Saudi Arabia's 2.3/5 culture score (across 2 scored cities); Yemen has no culture score data yet — not enough data to call a winner.

Saudi Arabia's passport reaches 48 destinations visa-free to Yemen's 7 — Saudi Arabia 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.

Saudi Arabia's 109M passengers/yr annual passenger volume (across 4 scored cities); Yemen has no annual passenger volume data yet — not enough data to call a winner.

Saudi Arabia runs 6°C to 47°C for most people; Yemen runs 11°C to 34°C for most people. Turaif runs colder, at -9°C; Aden runs hotter, at 45°C. Depends on you — which range fits your tolerance is the real question here, not a score.