I think you're asking if a series of arcs is stronger than a wavy line. It's a great question and I think the answer to that would require a full model of the two walls to calculate all the stresses, etc. But I think it would also depend on the question of "stronger against what?" A pushing force but at what point and at what angle. Even height might make a difference.
My gut instinct is that the point where a wavy wall changes from curving one way to another is a slight weak point and perhaps an angle there would actually be stronger. Might be totally wrong.
My gut instinct is that the point where a wavy wall changes from curving one way to another is a slight weak point and perhaps an angle there would actually be stronger. Might be totally wrong.