CREATE TABLE table_204_636 (id DECIMAL, "season" TEXT, "tier" DECIMAL, "division" TEXT, "pos." TEXT, "notes" TEXT)

which season was more successful , 2007-2008 or 2005-2006 ?
SELECT "season" FROM table_204_636 WHERE "season" IN ('2007-08', '2005-06') ORDER BY "pos." LIMIT 1
SELECT "season" FROM "table_204_636" WHERE "season" IN ('2007-08', '2005-06') ORDER BY "pos." NULLS FIRST LIMIT 1