It's difficult to say definitively which planet is the "windiest" because wind speeds can vary greatly depending on location and time. However, Neptune is generally considered to have the strongest and fastest winds in our solar system.

Here's why:

* Super-fast winds: Winds on Neptune can reach speeds of up to 2,100 kilometers per hour (1,300 miles per hour). This is about twice as fast as the strongest hurricanes on Earth.

* Internal heat source: Neptune's internal heat source, combined with its rapid rotation, creates powerful atmospheric circulation patterns that drive these intense winds.

While Neptune has the fastest winds, Jupiter has a massive Great Red Spot, which is a giant storm with winds exceeding 400 kilometers per hour (250 miles per hour). It's a constant reminder of the planet's powerful atmospheric activity.

So, while Neptune might have the overall "windiest" title, both Neptune and Jupiter boast some truly incredible and powerful winds.