Different ways work for different people, and the “(((((((” way works for very many. 
For a four-condition choice, I sometimes use it myself.
But that’s also about the point where I start finding it harder to parse a big stack of brackets on either side; and when we get to a six- or seven-condition choice, I definitely find e.g. “((a + b) + (c + d)) + ((e + f) + g)” easier to logic-check and keep bug-free than “(((((((a+b) + c) + d) + e) + f) + g).” The opposite will be true for some people, and that’s fine.
Regardless, it’s important to understand the “only give ChoiceScript two things at a time” principle, or else if you want to put together something with the more complex logic of mixed ors and ands, like
(((a or (b and c)) and d) or (e and f)
you won’t have a chance.
Edit: of course, you don’t have to code that level of complexity into your game in the first place.