Both materials can create floors without grout lines, but they look and perform differently. Microcement has a mineral, hand-trowelled finish. Epoxy is a resin system often chosen for a more uniform surface or for specific technical performance.
Microcement often suits interiors that want natural variation and the same finish across floors, walls or built-in features. Epoxy may be better when the project needs a tested resin system for a specific industrial, chemical or hygiene requirement.
Compare the exact products. There are many types of microcement and epoxy. Performance claims should come from the exact proposed products, not from the best result found for any product in the wider category. Start with the project needs: appearance, base, water or chemical exposure, traffic, cleaning, grip, installation time and possible repairs.
When epoxy may be better. An epoxy system may be better when a tested technical requirement comes first, such as resistance to a particular chemical or a specific hygiene or industrial need. Check the manufacturer's technical documents and the site conditions. The word epoxy alone does not guarantee every type of performance.
When microcement may be better. Microcement may be better when the project wants a crafted mineral surface rather than a uniform resin floor. It offers visible trowel work, custom colour direction and continuity across floors, walls and built-in forms. It still needs the right protective system and regular care. Do not use it for a specialised technical requirement unless the product data supports that use.