BLE is buzzword, almost meaningless on technical level. You need to say which exact features you are looking for and these must be then supported by two elements: HW and BLE stack. You have choice of using Nordic BLE stack (aka Soft Device) and then you probably need some matching nRF SDK. Easy recommendation is: USE THE LATEST (v14.2.0) and read very carefully both release documents and migration document for the Soft Device. Finally if you are not fine with current feature set of nRF52832 you have choice to switch to nRF52840. If you are not satisfied with capabilities of Nordic BLE stack then you can either develop your own stack (which is unlikely but possible) or switch to some other variant (there are companies offering their own stack on nRF5x platform and there are also great open source alternatives like Zephyr).
