CREATE TABLE table_203_391 (id NUMBER, "season" CLOB, "greek league" CLOB, "greek cup" CLOB, "europe" CLOB, "coach" CLOB, "roster" CLOB)

vasilis goumas or antonis christeas participated in more championships ?
SELECT "roster" FROM table_203_391 WHERE "roster" IN ('vasilis goumas', 'antonis christeas') GROUP BY "roster" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "roster" FROM "table_203_391" WHERE "roster" IN ('vasilis goumas', 'antonis christeas') GROUP BY "roster" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY