There are a few contenders for the latest gadget of 2021. The Apple Watch Series 6 is one option. It has a new blood oxygen sensor and monitor, which could be handy for tracking your health. The Samsung Galaxy S21 is another option. It's a 5G-compatible smartphone with a lot of features and a sleek design. The Sony PlayStation 5 is also a possibility. It's a powerful gaming console with a lot of features that gamers are sure to love. Ultimately, it's up to you to decide which gadget is the latest and greatest.