Comparing "truly" vs. "really": nuances and uses

What is similar?

Both "truly" and "really" are adverbs used to emphasize or confirm the truth or reality of a statement.

What is different?

While both can be used for emphasis, "truly" often implies a slightly higher degree of sincerity or depth of feeling. "Really" is more common in everyday language and can be used both for emphasis and to express surprise or skepticism.

Which one is more common?