Hi. I wonder if anyone knows off-hand the differences in the various types of protein powder. (I know I can google, but figured to ask you guys first

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I use MRM brand whey protein powder to make smoothies. I have no medical issues. So, when I go to reorder, I notice that there are several other types, including isolate, which is more expensive, egg white, and veggie. Is there one advantage to using one type or the other?
I'm on weight watchers so I use the protein powder to mix with almond milk and some fruit for a healthy breakfast or snack. Im eating regular food during the day too.