Karnaugh Map whic one is true?

I have a karnaugh map question. In the Digital Design course teacher learnt but I couldn't understand here clear. We can see in the picture. In the first one, we use all 1s and have 4x3 1s. In the second one we have 8x2 1s and we use some 1s two times. Which answer is true? 1st one or 2nd one? Why?

Thanks for all responses.

Both are valid expressions for the illustrated function.

In most contexts A+C would be preferred since it is a simpler expression.