Sorry for the late reply to this discussion full of great ideas.
First Basis confirmed me that both Peak AND B1 services will be shut down on Dec 31st.
As for an alternate to Peak/B1 I add a +1 to setting up some kind of Zeo like approach where the data can still be obtained from the device after the Basis servers are turned off.
But from my perspective the only data I have really used out of both devices is the heart rate while sleeping. As crazy as it sounds I haven't found another sleep tracking device that provides data every 1 minute. With the exception of NeuroOn, which I haven't tried but is tempting (not advertising it, just trully curious as it is a different type of device than a wrist one)
Since I am using other sleep trackers to track my sleep onset time, the only valuable data provided (in my opinion), I am considering getting a Wrist Pulse Oximeter instead.
I have a spreadsheet type of list of sleep trackers, with about 70 different devices listed. So I would be more than happy to help contribute to a product roundup section. As I have tried devices over the years I realize there is a lot of junk in that sleep tracking device field. And it is hard to get info on details that matter (to me), like the frequency of heart rate data at night.