"Transient" and "transitory": words of fleeting nature

What is similar?
Both "transient" and "transitory" describe something that is temporary or short-lived.
What is different?
While both words convey temporariness, "transient" can function as both an adjective and a noun, often referring to something that passes quickly or a person staying briefly. "Transitory" is solely an adjective and emphasizes the brief duration of something, highlighting its tendency to change or pass away.
Which one is more common?

Examples of usage
Transient- The transient rain shower left the streets glistening.
- She stayed at the hotel as a transient guest.
- The city's transient population makes long-term planning challenging.
- Youth is a transitory stage of life.
- They experienced a transitory period of prosperity.
- The excitement was transitory, soon replaced by routine.