If by color enhancing you mean brightening, then Fire and Yellow Belly are two of the most popular color enhancing genes. Hypo is also a great one, but is a recessive gene so it is possible to be carrying the gene and not show it visually (called a "het Hypo"). Enchi is color enhancing, but is generally thought of more as pattern cleaning. Many genes are both color and pattern changing versus only doing one or the other primarily.
I also get the sense that you're asking for a larger reason. What do you have in mind that you're wanting to being out the best in?
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