CREATE TABLE table_203_370 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "event" TEXT, "notes" TEXT)

which competition is listed the most in this chart ?
SELECT "competition" FROM table_203_370 GROUP BY "competition" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "competition" FROM "table_203_370" GROUP BY "competition" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1