Are quartz worktops better than granite and marble stones?

Yes, quartz kitchen countertops are way better than granite and marble (and even any other natural stone) in many cases. For example, quartz is better in terms of non-porous surface but natural stones are all porous that leads to further maintenance complications and health issues.

Also, quartz do not require regular sealing but granite do. Plus, quartz is better stain, chip, and crack resistant than granite and marble. And if you want consistent colours and easy maintenance, quartz is the only solution.