Who's Right?

"There is a certain relief in change, even though it be from bad to worse! As I have often found in traveling in a stagecoach, that it is often a comfort to shift one's position, and be bruised in a new place."
--Washington Irving

Vs.

"Striving to better, oft we mar what's well."
--Bill Shakespeare. King Lear, Act I, Scene iv, Line 371
&
"Never swap horses crossing a stream." --Anon.