Unfortunately, I don't have any comparisons to offer. But I felt they would help and do have a set in my current and next engine. We have restrictions on oil pan designs, but are allowed deeper sumps. We can do whatever we want inside, but I never felt comfortable with windage trays, especially with a deeper sump that keeps the oil level further away from the rotating assembly. I do like the idea of a properly designed tray/scraper combo. I fabricated a crude one several years ago, but it wasn't as sturdy as it needed to be. Haven't had time to experiment lately.

Crank Scrapers