this.watch vs. on Mutate for handling changes in a backdraft watchable

In a backdraftjs component with watchable 'titleString', is there any difference/preference between

this.watch('titleString', this.handleTitleStringChange);

and

onMutateTitleString(newTitle, oldTitle) {
    ...
}

The onMutate has the benefit that it remembers the old value (oldTitle) but this.watch() is maybe a little easier to find in code since it contains the word titleString -- where for onMutate you have to know to search for the camelcased-and-concatenated version.

Are there any other reasons to use one or the other?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/9yCVw1N

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