Answer:
Both are correct.
Step-by-step explanation:
The given sentences are
"Esas fresas son de Manuel", or "Son sus fresas"
Both statments are correct, but the difference is that using the first sentence you actually express the exact person that owns the fruit. In the second sentenc you talk without using first names.
Actually, the first form is used when the person is not present. The second form is used when the person is present and you point him to indicate that they are his fruits.