For many IOT application only 128KB are few, are possible to have 256KB on future?
At this time the STM32F411 based Avnet BCM4343W module is the only one available
I recommend discuss your requirements with your local Avnet FAE, who can advise on alternatives if your specific use case warrants this
For the app development, you must have the best computer which will give you help to develop a large size of teh application easily. I can do the assignment writing service which will help all the developers to choose the exact computer according to their work.