For the purist, the best library is the one you make yourself.
The Ensoniq TS-10, released in 1993, is often considered the "apex" of Ensoniq's synthesizer line, known for its unique combination of wavetable synthesis, "Hyperwave" wave sequencing, and the ability to load ASR-10 samples. While no official Native Instruments library exists, several third-party developers have created Kontakt libraries to capture its distinct "digital but warm" character. Popular Kontakt Libraries & Sample Packs ensoniq ts-10 kontakt
If you own a physical TS-10 (or know a friend with one in their attic), this is the superior method. Kontakt 7 and 8 come with an feature that turns hardware into software in minutes. For the purist, the best library is the