This week we have two papers assigned on seemingly the same topic from the same first author:
In this OP, identify two main differences between the two approaches and explain the benefits/drawbacks of each one. Note that an OP does not give you much space, so don't spend useful writing space on introductions, conclusions, etc. I expect you will have at most four paragraphs in this OP: two defining the differences and other two for pros/cons of each difference.
Favorite OP1: Vitaly's OP