I did a small prototype with both Mantine and Chakra to see which would be a better fit. I was primarily looking for whatever would make it easiest to build fast. Mantine ticked all the boxes and ended up looking a less verbose solution with more features.

Out of all the UI libraries for Reach, Mantine has some of the best documentation, demos, interactive sandboxes, and entire pre-built pages. The default look and feel is really appealing!