the tree chart is hard to make fine distinctions in scale.
the pie chart on the other hand would be able to show the portion of your holdings by the category you set and then by individual shares a level or 2 down.
with pie charts you don’t just compare 1 company to your whole portfolio like with the treemap, you see it in relation to similar companies in an industry and then you can see how industries compare etc. so between the 2, pie charts make more sense for the majority of users.