How do I use my Mac plugged into power?

Hey guys, I usually use my laptop at home, plugged into power, for 3-4 hours a day (at night, most of the time), always with full charge.
I'm aware of the battery calibration and that Apple suggests that we do it once a month and everything.
My doubt is, during the period when I'm not using my Mac (during daytime, when I'm at work), what's preferable:
1. That I leave it plugged into the power, so the charger keeps the green light and the battery level?
OR
2. That I unplug it from power when I'm not using and then, when I get home to use, I plug it and use?
I've been doing the second way, but I'm afraid that during the hours that the laptop is off and unplugged from power, that it might lose some battery capacity and then, when I plug it again, the charger start to charge the battery.
Anyway, the way I've been doing, when I connect the charger, it's always the green light, it never starts to charge, although the battery level never exceeds 99% ( but it says "fully charged").
So, what's preferable?
Thanks!

There is no reason to leave the computer on battery power if you can connect it to an AC power source. Leave it connected to the charger unless you need to use it on battery power.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

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