I use CUBRID in most of my projects. The idea of being "better than MySQL", I think, depends on the situation, on the needs of your application. For some, CUBRID is very nice, for some MySQL or some others. For example, CUBRID has very nice features optimized for social networks, where you often have a lot of traffic on one page, use a lot of indexes and use a coverage index. They provide some good examples of how to design a database schema and how to tune queries for maximum performance ( link ).
What is your case? If you expect several hundred users at the same time to generate thousands of new records every day, CUBRID can easily handle this. This is what database systems are for.
You must also consider the environment in which you work. Is your application built in PHP, Python or what? We use PHP and Java on our sites. CUBRID has many drivers. I believe that you can find the necessary driver on your site.
You should also look at community support. If you have any questions or problems with their database, it is often faster to write to their Q & A site or forum .