Answer:
This is more of a personal experience for everyone.
Though a majority of the people/children would agree that face-to-face is easier.
First of, you could cheat in online learning. It will scrap a whole year of leaning for you, and when you go back to face-to-face, you would be on the same leval and lag behind your friends.
Second, online learning changes a lot of kids behavior, while face-to-face learning makes kids more confident and more likely to speak out. Online does the opposite. It sometimes makes kids more timid and they wouldn't speak up about questions, it's a double-edged sword.
And Third, Parents have work. Your parent could drop you off at school and do whatever they like for 6 hours, then come back. But if your at home, they will have to take care of you.
And lastly, Fourth, Sleeping. Online school usually messes up your sleep schedule. Sleep late, Wake up late. While it might seem nice, it's not. Especially for long-term reasons. When you go back to face-to-face, you will have to wake up earlier and you'd find yourself tired of school.
There is more reasons, but I can't list them all here.
Anyways it usually depends on the student.