Which is better local disk C or D?

Could you please clarify for me, which storage option is generally considered more advantageous between a local disk C and a local disk D? Are there specific factors that one might consider, such as speed, capacity, or reliability, when making a decision between the two? Additionally, are there any potential drawbacks to choosing one over the other, and could the answer vary depending on the user's specific needs and setup? I'm eager to understand the nuances involved in this decision.