I swear people like you are why I lose faith in humanity.

Little reminder from my elementary school

Golden one adds 1225, purple 6%

To solve at which stat level 6% equal 1225 you need to use proportions.

1225 = 6%
X = 100%

X = (1225*100)/6

X= 20416,6

Answer: Purple ginseng is better than yellow one when stat you are interested in is higher than 20416. It took me longer to write this than calculate problem itself.