South Korea vs Thailand

Between the two, Thailand is cheaper — $1,089/mo vs $1,441/mo. South Korea is pricier than 17 of 22 Asian countries; Thailand is pricier than 14 of 22 Asian countries.

Between the two, South Korea is safer — 4.1/5 vs 2.3/5. South Korea is safer than 18 of 22 Asian countries; Thailand is safer than 12 of 22 Asian countries.

Between the two, South Korea scores higher on mobility — 4.5/5 vs 2.4/5. South Korea is easier to get around than 21 of 22 Asian countries; Thailand is easier to get around than 12 of 22 Asian countries.

Between the two, Thailand scores higher on culture — 4.0/5 vs 3.0/5. South Korea is lighter on culture than 10 of 21 Asian countries; Thailand is richer in culture than 19 of 21 Asian countries.

South Korea's passport reaches 123 destinations visa-free to Thailand's 39 — South Korea 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 Korea is better connected — 150M passengers/yr vs 118M passengers/yr. South Korea is busier than 73 of 87 countries worldwide; Thailand is busier than 69 of 87 countries worldwide. South Korea sees ~3 air passengers per resident a year; Thailand sees ~2 air passengers per resident a year — a derived figure, not itself ranked.

South Korea runs -19°C to 35°C for most people; Thailand runs 20°C to 40°C for most people. Depends on you — which range fits your tolerance is the real question here, not a score.