Whether expensive strings sound better is subjective and depends on various factors including the instrument, the player's preferences, and the specific qualities they're seeking in their sound. Expensive strings often come with claims of superior materials, construction, and craftsmanship, which may result in better tone, durability, and playability compared to cheaper strings. However, the difference in sound might be subtle and may not be noticeable to every player or listener.
Ultimately, the best strings for a player are those that suit their playing style, the characteristics of their instrument, and their personal preferences. Some musicians may find that expensive strings offer the tonal qualities and responsiveness they desire, while others may achieve their desired sound with more affordable options. It's essential for musicians to experiment with different strings to find what works best for them.