Is knitting easier than crochet?

This truly is a matter of opinion.

One could argue that crocheting is easier than knitting because there is only one needle/hook, as opposed to the two needles in knitting.

However, knitting is simpler (there is a difference between "simple" and "easy") than crocheting, having fewer basic stitches and an easier-to-understand material.

The basic stitches in crochet are easier to learn, but are also easy to mess up. The basic knitting stitches are harder to master, but once learned, are more difficult to mess up.

In all, I would recommend that younger children learn to knit, and anyone over the age of 10 to do either, though crocheting might have the advantage, since it usually takes less time to do.