Which looks cheaper today: Japan or Europe stocks?
On the current data, Japan Equities has a P/E of 19.52, while Europe Equities has a P/E of 18.78. On P/E alone, Europe Equities looks cheaper and Japan Equities looks more expensive.
That comparison is only a starting point. Different markets can have different sector weights, growth expectations, interest-rate sensitivity, currency risk, accounting rules, and ETF methodology.