articulate the differences in these two snippets. which one is "easier"? which one is "simpler"?

gistfile1.js

function XYZ() {
   X();
}

function X() {
   // do X
   Y();
}

function Y() {
   // do Y
   Z();
}

function Z() {
   // do Z
}

gistfile2.js

function XYZ() {
   X();
   Y();
   Z();
}

function X() {
   // do X
}

function Y() {
   // do Y
}

function Z() {
   // do Z
}

The latter!