Zoom is a newer platform and Teams is an app from an established company.
Zoom is a much newer company while Microsoft has been around for long time. Because Zoom is a newer organization within the past year of 2020, the platform did see some issues that a newer company is more likely to experience, such as cyber breaches. People began joining private calls who were not allowed. This issue was eventually resolved, but it leaves a little hesitancy in whether Zoom has discovered all its problematic holes in the system.