This gentleman sums it up nicelyThe Qing were arguably at the apex of their power around this time. They had completed conquests of enormous stretches of land, the economy and population of China were booming and they stood at the heart of a tributary system that covered most of East Asia. You could make a good point for China being one of the most powerful nations on Earth at this time, let alone in Asia, despite the lack of power-projection they had outside East Asia.
Meanwhile, Tokugawa Japan was not exactly in a bad state. The Tokugawa era saw economic development and relatively good governance. However, the fact that she had isolated herself from the world did limit the amount of power she wielded. The Qing were unquestionably more powerful in almost all respects.