I've just started listening but I'm really enjoying many of the MIDI files from https://supra.stanford.edu/
Thank you for bringing that to my attention!

Thanks for the feedback! I am especially enjoying Teresa Carenno! Happy you like it..

I took these files and wrote a bash script which then uses pianoteq headless to do batch conversion of the midi-files to mp3 using my favorite pianoteq preset. You find all the details as a tutorial here:

https://youtu.be/DbrEgoSosFs

Thus you can conveniently browse the full collection as mp3 and dive deep into those historic performances. The sound and listening quality is amazing, although welte-mignon seems to have some restrictions in capturing details or exact timing.

Attribution:
Zhengshan Shi, Craig Stuart Sapp, Kumaran Arul, Jerry McBride, Julius O. Smith III. SUPRA: Digitizing the Stanford University Piano Roll Archive. In Proceedings of the 20th International Society for Music Information Retrieval Conference (ISMIR), pages 517-523, Delft, The Netherlands, 2019.

Maybe you have a pianoteq preset which does a better rendering?

Thanks and enjoy!