Which analysis involves the comparison of financial ratios of different firms at the same point of time?

Cross-sectional

Ratios help comparisons with certain bench marks to assess as to whether firm’s performance is better or otherwise. For this purpose, the profitability, liquidity, solvency, etc., of a business, may be compared:
(i) over a number of accounting periods with itself (Intra-firm Comparison/Time Series Analysis),
(ii) with other business enterprises (Inter-firm Comparison/Cross-sectional Analysis) and
(iii) with standards set for that firm/industry (comparison with standard (or industry expectations)