[bjornlouser]

The main difference (to my untrained ear) is usually interpretation of tempo

Take Rachmaninoff's Cello Sonata Op. 19, 2nd movement

https://www.youtube.com/watch?v=ZT9qe_euX8g (Sheku & Isata)

https://www.youtube.com/watch?v=0fZwD-Jq554 (Ax & Yo Yo Ma)