Advantages of a Comparative Balance Sheet:

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Data for multiple years in a single format
A typical balance sheet merely shows the account balances on a single date; however, a comparative balance sheet shows not only the account balances on multiple dates but also the change in the data over time. This aids in trend analysis.

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Ratio analysis
Financial ratios are derived from a balance sheet. As a comparative balance sheet provides data for multiple years, it is easy to calculate and analyze financial ratios with its help.

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Easy analysis of the trend
It assists a financial analyst in determining the nature, breadth, and direction of change in various balance-sheet components.