well..don't just look at the size, the features is what makes it different. the 24" is ultrasharp, which designers would love as they tend to have better color calibration, even compared to Apple Display. plus it is fully adjustable, 16:10 monitor with more ports shenanigans behind it. if you want to compare in term of size and same features, i think u should compare u2415 with u2715 instead. For the current comparison, I would pick U2415 over s2715H