Of one's own volition and Of one's own choice

Of one's own choice and of one's own volition are semantically related. in of one's own free will topic. In some cases you can use "Of one's own choice" instead an adverb phrase "Of one's own volition".

Of one's own volition and of one's own choice are semantically related. You can use "Of one's own volition" instead an adverb phrase "Of one's own choice".