I have used both Schmetz and Klasse' needles. I don't notice a big difference in them until I start to FMQ . I use a 90/14 Embroidery to quilt with and find the Klasse' to be a stronger needle than the Schmetz.. I break fewer and they last longer, at least that is my experience with them. I buy mine from Nancy's Notion when she has the big sales.
Jacke