both offer great climbing in a chossy adventure remote way
Sept might be starting to get ok for the 'bungles. Its tricky there, winter is too cold & days are too short, summer is too hot but the days are longer. You have to find the right in-between time.
Kaputar is inland & 900m ASL. ie fk-off cold at night. Don't go in winter. September might be ok.
don't go to either place without climbing partners if you want to climb. BUT if you have a vehicle then you should go to both places anyway - both are very special places to poke about in even if you can't arrange a belay slave.