I use my phone and laptop all day and i was wondering if it is better to keep them both plugged in and topped off at 100 or do the 20/80 thing and charge till 80% and let the battery drop to 20%, then charge back up to 80%.

FYI: I use my phone and laptop about 12+ hours a day so i would be doing the 20/80 thing many times per day.

Which option is better for my battery life? And should i treat my phone and laptop differently?