Less jews survived in Warsaw than anywhere else, because in August 1944 the Poles had their own uprising against the Nazis and the Nazis basically leveled Warsaw to the ground (The city was rebuilt after the war) There were probably thousands of jews in hiding and they were killed when the city was destroyed
The head of the Judenraat in Lodz was a Rasha named Mordechai Rumankowski who was a Nazi collaborator, he did manage to stall the deportations from Lodz until august 1944 and 750 jews were left behind to clean the ghetto. They were liberated when Lodz was liberated in January 1945.
More jews actually survived in Berlin than in Warsaw