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@jgomez Deepsleep is the best option for powersaving since you can get down to a uA level of consumption. When i use lightsleep on my FiPy + Pysense, and remember to disable all network capabilities and sensors on the board, i get a consumption of about 6.8 mA.
Lightsleep does however not "reset" the FiPy, it remembers where it went to sleep, and starts from there. So lightsleep is great, if you want to be able to save power, but you still need the capability to wake-up fast without re-booting.
So if a project requires that your WiPy must be sleeping, unless it gets an interrupt, and then must be able to quickly wake up to, lets say, start sampling from a sensor immediately, then lightsleep is the way to go. Then if you know that there are longer periods with inactivity, you could always time it so thats when it goes into deepsleep mode.