Yes, in our opinion, the Annapurna Circuit is easier than the Everest Base Camp trek. We say this because the Annapurna Circuit requires you to trek about 50 km versus roughly 130 km for the Everest Base Camp trek. Also, your overall increase in elevation during the Everest Base Camp trek is more.
If you'd like to know more about how the two treks compare in terms of difficulty, as well as other measures and features, please read Annapurna Circuit vs Everest Base Camp.