Better is really subjective... better what? Flavor? less likely to gunk up?
Flavor is also subjective... I personally hate the coffee & tobacco flavors... my cappuccino flavor has sat for 4+ months and is practically black, my Hennessy flavor is a dark brown color. The coffees and chocolates tend to steep into very dark colors, but that doesn't make them "better".... try various sample flavors & you'll know what you prefer... I hate the creamy or bitter flavors but I like the fruits & drinks especially when there's a "sourness" to it like raspberry lemonade.
As mentioned above, darker juices tend to gunk up the coil more... I think that the 50/50 pg vg mix gunks much more than a 70/40 pg/vg mix as well.
In summary.... no, color doesn't make a juice "better" than the other at all, your priorities determine what's a "better" juice, do you want flavor or vapor production or throat hit?