I've heard that at least initially, with any rechargeable-battery operated device, one should charge it up to 100%, then use it on battery until it drains completely.
Ever so often(once ever few months) i let my devices use the entire battery before charging them back up.
Conditioning isn't really needed anymore. In fact, running a battery such as those in phones or Macs down to 0 is actually BAD for the battery.
As for my opinion how how to best use the battery, use it on battery when needed, plugged in when not. Refer to my post here for the stats on the battery in my 2012: https://forums.macrumors.com/threads/battery-advice.2026884/#post-24182739