Sleep or shutdown?

Hi all! I bought a used Steam Deck 2 weeks ago and I am loving it! I am playing Fallout 4 on it and it works amazingly good!

So, what is your choice when you finish playing?

I put the Steam Deck to sleep and the next day the battery was 7 percent lower than before. I am thinking of just shutting it down so it doesn't drain battery in sleep mode.