murbert My question is who is paying for it? Tha will tell you much about whether the Steam Deck is for you.
That was my (father of four, foster of one, and grandparent of several) thought, too. But even if @Barbiefan1475 is paying, parents have the final word.
@Barbiefan1475, you and your mom might want to read some reviews comparing the two platforms, looking at the questions as objectively as possible. As others have said, the two platforms are different and which will be better for you will depend, in large part, on how you plan to use the device. You and/or your mom (either or both) might be surprised at the answer you get. As I see things, the operating system (Steam OS vs Windows) is a secondary consideration.
I'm not a gamer and don't have an option otherwise.