Minor superficial scars do not necessarily indicate poor quality, but they are not a guaranteed sweetness meter either.
Do Darker Stripes Mean More Sugar?
Not necessarily.
Striping patterns are strongly determined by the watermelon variety.
One type may naturally have very dark contrasting stripes, while another excellent variety may have a much lighter rind.
When comparing fruit, it is more useful to compare watermelons of the same variety than to apply a universal color rule to every melon.Watermelon
The field spot and overall condition can reveal useful information, but