No records worldwide, but fractions are mostly used for thirds, halves and quarters and "one in a million", whereas percents are used for most other numbers where percentage is between 1 and 99 (Note football demands 110% from its players!)
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Decimals until you get to values with over nine decimal places, then fractions are more exact
Decimals are more commonly used.
Convert them to one or the other. Your answer will usually be more accurate if you're adding fractions.
It really doesn't matter whichever one you are more comfortable with. fractions are a bit more challenging to convert.
A calculator can convert numbers that appear as decimals into numbers that appear as fractions. Fractions are generally considered more easy to use then decimals.