You are correct in identifying that EAL/D has superior alignment when compared to English Standard. Back when I did my HSC, I was supposed to take EAL/D, having been in Australia for just over a year (although I believe that your current level would have exceeded mine back then). However, I was unable to take it due to a clash with another subject, and as someone who is not a native speaker and whose English was not great at the time, English Advanced was definitely beyond my capabilities, which left me with English Standard.
The main difference between EAL/D and English Standard/Advanced lies in the need to complete a listening exam as part of the HSC exam, similar to listening exams in Stage 6 LOTE subjects (the only minor difference being that the EAL/D listening paper is completed separately from Paper 1 and Paper 2). In terms of the syllabus, EAL/D incorporates the Common Module as Module A, the English Standard Module A as Module B and a Module C called "Close Study of Text".
Life'sHard mentioned important points. First, given that students taking EAL/D come from a non-English speaking background and/or may not have English language proficiency, English Advanced students have a higher chance of performing favourably compared to their EAL/D counterparts. However, if you are confident in your ability to perform well and rank high should you choose to take EAL/D (which, from your post, seems possible), then EAL/D could be a good option.
The other point is that of admission into university. Generally speaking, if there are no prerequisites specifying English Standard or higher for a particular degree(s), then EAL/D should not obstruct your entry into university. Regarding the Bachelor of Commerce, UNSW includes English Advanced as recommended studies. Despite this, English Advanced is not a prerequisite, meaning that you can still receive an offer if you choose to take EAL/D.
I hope this helps!