Classical sitting position has advantages and disadvantages…and so do the other sitting positions.
I did a bunch of posts on the various positions and the trade offs, starting here Sitting position, slight difference that makes a difference? - #21 by Tbushell
Lots of other good advice in that topic as well.
I started with “classical with strap” position, because I found that made the guitar very stable, and gave me the most relaxed and visible position for my fretting hand.
When I started thumb muting, and didn’t need to look at my hands all the time, I switched to “casual with strap”…which was a big change! But I still go back to classical position when I’m learning a difficult chord.
My suggestion would be to experiment with the various positions…one will probably jump out at you as most comfortable. Stick with that for a while until you learn the basics. You can always revisit later on when you are more experienced.