If you need a more general-purpose interface to browse and compare full-resolution satellite imagery, Sentinel Hub is a great option. It provides a cloud-based API, including the EO Browser interface that lets you browse, compare and download high-resolution imagery and 3D views. The service also includes tools for time-lapses and statistical information services, too, so it's good for a wide range of remote sensing tasks.
Another good option is Nearmap, a location intelligence service that offers high-resolution imagery and 3D modeling. It's geared for businesses, communities and governments that need up-to-date views from many angles, detailed 3D modeling and AI-generated data sets for attributes like property size and type. It's good for urban planning, environmental assessments and disaster response.
If you want to tap into Earth Engine data sets without a lot of programming, Earth Engine Apps offers a collection of interactive user interfaces. There are apps like Linked Maps for panning and zooming multiple Landsat views, Split Panel for comparing two maps, and the Global Population Explorer for exploring global population data. The apps are a good way to get a handle on lots of Earth Engine data sets without having to dig into programming details.