With few exceptions you get what you pay for in reasonably priced high end audio. The caveat being if the rest of your system can take advantage of it.
My most recent preamps include-
1) Vintage early 80’s Pioneer solid state. Used as a backup. Sound is lackluster and dull. Small sound stage, poor dynamics.
2) Rogue Audio RH-5 Linestage / Headphone amp. Tube buffer stage. Sound was spectacularly dynamic and powerful. Sound stage very large in all directions. Tonality was neutral and refinement was good.
3) Rogue Audio RP-7 preamp. Sound was rich and beautiful. Dynamics not as good as the RH-5. Sound stage was large. Sound was a touch too burnished but highly refined and colorful.
4) Cary Audio SLP-98. Sound was slightly rich and neutral. Transparency and tone accuracy / musical recognition was through the roof- goosebumps. Dynamics were very good, refinement good. Soundstage very large.
5) Cary Audio SLP-05. Sound is warm, rich but highly detailed. Amazing high end sound quality- refined and colorful- passes the ears test with flying color. Dynamics very good. Sound stage is enormous in all directions, the sound projects out to the listener. My final preamp.