I am hesitating at using "a wide choice of display options" or "wide choices of display options"...

Which expression is correct and what is the general rule?
Sorry if I don't answer your question directly, but I would simply say 'many display options'.
Maybe someone else can give you a more direct answer.
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That is not an individual problem. I am always not sure in these kinds of instances. Chinese is very different from English, at least in this point - "plural or not"?
"a choice of options" - can pick one of a group of options.

"some choices of options" - can pick several of a group of options.

You could use "wide" to modify both of these phrases.

However, since a choice is often an aggregate of many little choices, "wide choices of options" is not really used.

Go with "a wide choice of options".