Hi hope that you are well. Your question is really general. Is there is a reason why you are worried that USCIS will deny your application. Perhaps beginning there would lead to a more focused question. Best of luck!
If there is no good reason for denial you would probably be approved. Reasons for denial may include arrests, gang membership, drug use, or other activities that make you undesirable in the U.S.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
You contradict yourself in your question . If you understand that the decision is discretionary then you understand that they can deny you for no reason at all. They do not need a reason.
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