Stacking up: "hoard" vs. "amass"

What is similar?

Both "hoard" and "amass" refer to the act of accumulating or gathering a large quantity of something over time.

What is different?

"Hoard" often carries a negative connotation, implying secretive or excessive accumulation, sometimes to the detriment of others. It suggests keeping items hidden and not sharing them. "Amass" is more neutral, simply indicating the gathering or collecting of items or information without the implication of secrecy or selfishness.

Which one is more common?