Was ist der Unterschied zwischen choose one from these items und choose one among these items ?Du kannst auch einfach Beispielsätze geben.

The meaning of the two sentences is the same. You can use "from", "among" or "from among" all to mean the same thing in this context.

For example, imagine you draw a winning ticket from a lottery and you win a small prize.
"Choose one prize from these items."
"Choose one prize among these items."
"Choose one prize from among these items."
All three sentences have the same meaning.

Thinking more about it. I think "from" has a nuance of taking something out.
"I took a beer from the fridge."
"I come from the UK."

Which is why when I look at at the sentence.
"Choose one prize among these items."
I feel like I want to extend it.
"Choose one prize among these items to take with with you."

But with these sentences.
"Choose one prize from these items."
"Choose one prize from among these items."
I don't feel the need to add "to take with you" because taking the item is implied by the "from"

This is complicated and I'm not even sure myself. Hope this is helpful somehow.