Topmount sinks come with a rim that rests on the countertop. Most of them come with predrilled holes for the faucet, and they’re much easier to install than under-mount ones. You can install them yourself without the need for a handyman. Undermount sinks need some requirements to be installed. For example, the countertop should be solid, whether stone, granite, or quartz. It also needs a professional fabricator to adjust the cabinet to the exact size. So, topmount sinks are the easier choice, but undermount ones are sleeker. Top mount sinks are also more affordable, so that’s one more thing to consider.