They will totally change color as they grow so it wouldn't really matter which one you pick as it won't look the same later. A no brainer for me would be the one with more spots.
The pattern/spots themselves don't change much though right?
Color wise I'm not paying much attention to since I know with almost every fish the color doesn't stay the same
This is no longer my ray but a forum member on here does own it now. This female had lots of spots close together when it was a pup and as it grew older they spread out a bit. Luckily it was in it's genes to pop out a few more spots as it grew older and turned out pretty nice. If this pup had fewer spots then it would be more noticeable of a difference when it got older. That's why I am always hesitant on buying pups as you never know how they will turn out. IMO the more spots the better.
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the right one seems like it could be a blue disc though it will fade with age