From the two combos I have personally produced, I would say the Ruppel Line keeps it's higher yellow colors better. I produced a Ruppel Pastel Genetic Stripe last year and he's still holding his colors. I also have a Ruppel Pastel Het Yellow Hypo that rivals Fireflies in coloration.
These are cell phone pics of the Ruppel Genetic Stripe and Ruppel Het Hypo.
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