The plan right now is to go with an nRF52840 chip (as you get the Bluetooth for 'free').
Is there anything in the ST parts that you really miss? ST do have slightly more powerful IO (and it's 5v tolerant) but the nRF52 parts are really good at low power, and the programmable IO on them is really neat.
ST have a really frustrating pricing strategy which means that I end up paying more for just the chip (if I can even buy it right now!) than I do for a certified module with the nRF52840 chip, antenna and crystal on!
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