They look much better if they are made to “diverge”, instead of cross, the eyes. Much “larger”, “deeper”... I think one way to describe it is that it’s like you are looking out of a window, instead of looking at an object in your hand, if that makes sense.

As for which one is easier: For some reason, I have always been able to do the “uncrossing” on command, and it feels more natural and more relaxed to me. I sometimes do it to compare almost identical things that are next to each other. Crossing my eyes feels straining.