1- What you prefer 2) Not possible in mission. AAing in GBs is so far the best. Yes, you CAN get a good amount of expert. Technically, you get much more experts if you can multitask at attacking and AAing. Else, get a PCA to AA.
Note that I said you CAN get a good amount of expert.`How fast you gain depends on many many factors and condition. Usually, if the crews are high lvl and have lot of rookies on it.
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