The difference between More often than not and Mostly
When used as adverbs, more often than not means usually, whereas mostly means mainly or chiefly.
check bellow for the other definitions of More often than not and Mostly
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More often than not as an adverb:
Usually; more than half the time; more likely to be the case than not to be the case.
Examples:
"'More often than not, tomato seeds will sprout even if they are a couple of years old."
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Mostly as an adverb:
Mainly or chiefly; for the most part; usually, generally, on the whole.
Examples:
"They're mostly good people, although they have made a few mistakes."
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Mostly as an adverb (obsolete):
To the greatest extent; most.