Finding Derfflinger's role in science-fiction fleets

Which Star Wars ship best matches the naval role of the Derfflinger class?

Malevolence is proposed but its fleet role is disputed. Star Trek's Nebula class is also suggested as a functional comparison.

The question defines Derfflinger's intended analogue as a fast, well-protected capital ship operating behind the strongest battle line. Malevolence is suggested, then challenged as a first-line ship. A reply instead emphasizes attacks on cruisers and disruption behind enemy lines, connecting that employment to the German battlecruiser idea. Star Trek's Nebula class is offered as an additional comparison even though the question asks about Star Wars. No single Star Wars equivalent is agreed.