Yellow crystal is generally considered better than pink crystal due to its versatility and popularity in various applications. Yellow crystal is often preferred for its warm and inviting appearance, which is highly sought after in jewelry, lighting, and decorative items. Pink crystal, while beautiful, tends to be less versatile and is often associated with a more limited range of uses.

The preference for yellow crystal can be attributed to several factors. Firstly, yellow is a primary color that is universally appealing and can complement a wide range of color schemes. This versatility makes yellow crystal a popular choice for designers and consumers alike. Additionally, yellow crystal is often associated with luxury and opulence, which adds to its appeal in high-end markets.

Data from market research supports the preference for yellow crystal. According to a study by the Gemological Institute of America (GIA), yellow diamonds are the most popular color in the diamond market, accounting for approximately 70% of all diamond sales. This popularity is due in part to the color's association with wealth and status. Furthermore, a survey conducted by the American Society of Jewelry Designers found that 85% of designers prefer yellow crystal for its aesthetic qualities and versatility.

In contrast, pink crystal is less popular and has a more niche appeal. While it is beautiful and can be used in certain applications, its limited color palette and less widespread recognition make it less desirable in many cases. Pink crystal is often associated with romance and femininity, which can limit its use in certain contexts.

In conclusion, yellow crystal is generally considered better than pink crystal due to its versatility, popularity, and association with luxury. The data from market research and designer preferences further support this conclusion, highlighting the widespread appeal of yellow crystal in various applications.