@athelene @missabgl hi there, please see my comments below:
EOI
Wait for ITA
Q1. Yes, since both occupations are in MLTSSL, 189 subclass may apply but still premature to decide what type of visa to apply until you have the exact points on hand. With EOI stage these days being more challenging and competitive, best not to be fixated with just 189 subclass. One application for both will suffice.
Q2. CDR with skilled employment assessment. If you have the budget, both of you should apply to gain partner points. Best to do skills assessment as soon as possible. It really doesn't matter if work experience will be deducted, no need to wait another year to apply for skills assessment. You've got decent points as it is anyway. That additional year (and points) can still be gained whilst your EOI is on queue.
Q3. PTE vs IELTS, that's an individual choice. I suggest to read and compare these two as they differ in delivery. Find which of these 2 you'll be comfortable with. I find a lot of my clients (even English speakers) get better results in PTE but it can't be assumed that it's easier as I have some who score higher in IELTS than in PTE.
All the best!