Ball or Spotted python?

[Pastel]

So I want to get a snake in the far future, and I want to do research on what I should get, and then on how to take care of that snake specifically. I really like ball pythons but I'm not sure how big they get, big as in the thickness of the snake, not the length. I need to know how big a healthy one will be in their older years, (10+).

If they're too big for my preference, I want to know a little bit more about spotted pythons. It's harder to find sources on them and I thought i'd ask around on a forum to see if someone knew anything more.

So the things I want to know are: How thick do they get when they are older? Is this an okay snake for a beginner snake owner? What are their temperaments and care requirements compared to ball pythons?(From what I can gather they are pretty similar but I want to be sure) Are they slow moving and cling to your hand/arm like ball pythons do? (I have considered corn snakes but from watching videos they move a little too fast and it makes me nervous)

Thanks in advance!