CREATE TABLE table_203_873 (id DECIMAL, "model name" TEXT, "length" TEXT, "width" TEXT, "height" TEXT, "riders" DECIMAL, "capacity" DECIMAL, "description" TEXT, "portable" TEXT, "notes" DECIMAL)

which model has the higher capacity , skater or surf 's up ?
SELECT "model name" FROM table_203_873 WHERE "model name" IN ('skater', "surf's up") ORDER BY "capacity" DESC LIMIT 1
SELECT "model name" FROM "table_203_873" WHERE "model name" IN ('skater', "surf's up") ORDER BY "capacity" DESC NULLS LAST LIMIT 1