What is the minimum amount of units you can get per Fabulous Crystal?

What is the minimum amount of units you can get from 1 Fabulous Crystal?
Also Is there a unit difference between the 5* and 6* PlatPool Bundle and which should I get if I am going strictly for units?
Also Is there a unit difference between the 5* and 6* PlatPool Bundle and which should I get if I am going strictly for units?
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What does the 15k one give and what does the 'expensive' one give?