More important to me (than crank length) is Q-factor and teeth on the rings - and maybe the bicycles' climbing characteristics.

I adapt to the triple's wider Q after a while, without special cycling shoe inserts.

However, I 100% agree that, if everything else is equal, when the going gets tough, small circles are easier to spin than bigger circles. If you are a masher, then IDK.

Don't forget to change the saddle height if making jumps in crank length. As I age my saddle height has dropped ever so slightly, ie effectively serving a shorter crank with the sam saddle height.