Here, we present SpatialBench, a well-controlled direct comparison of 4 spatial transcriptomics platforms (Visium, Visium HD, MERSCOPE, Xenium) paired with scRNA-seq and snRNA-seq in a single, dense and spatially complex tissue, mouse spleen. We provide a set of common quality metrics to compare and inform the selection of technologies and analysis approaches. We further evaluate the capability of different technologies to recover known biological features and uncover new insights in a mouse model of infection with a host genetic perturbation, providing a test system relevant to many real-life research questions. This project is intended to provide a continuing, open-ended resource for the evaluation and comparison of existing and new technologies for spatial analysis, which could be extended beyond spatial transcriptomics.