When there is ambiguity, then you have to return to the definition of the term. If you seek the peak value of the curve, then it is the highest maximum positive or maximum negative. In this case the peak means extreme values that is the maximum or the minimum values. However there is local and global extreme points. If you you seek global minimum it will be the right point at the top figure. If you seek the local maximum it will be the point in the middle.
In conclusion, you have to define precisely your target. Other wise you will have multiple possible solutions.