United Kingdom (1980–1995) against Brazil (1978–1991)
Nelson Piquet checks every box: more titles (3 against 1) and superior dominance once scaled to their era (24% of the maximum possible points per season, against 21% for Nigel Mansell). The picture isn't entirely one-sided though: Nigel Mansell shows a better win rate (16.6% against 11.3%), podium rate (31.6% against 29.6%), and pole rate (17.1% against 11.8%), while Nelson Piquet keeps the edge in reliability (41.4% against 49.7% in DNFs). They were also teammates (1986, 1987), so with the same car, and there the verdict is clear: Nelson Piquet finished ahead of Nigel Mansell in 14 races against 13.