argument between these two..
haha
much + non-count noun (a large amount of something)
much sugar; much milk; much wine; much butter; much sand
many + count noun (a large number of things)
many boys; many trucks; many rooms; many books
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more + non-count / more + count (A larger amount or number of ...)
more sugar; more butter; more boys; more books
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much and many say that the amount or number is great - not small.
more says that the amount of number is greater than another amount or number
when you make a comparison.
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You can't have "much chances" because "chance" is a count noun.
In both of your sentences you are comparing one thing to another, so you need "more" in both cases.