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Ian Gillan's screaming singing style is much closer to metal than Ozzy Osbourne's
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Deep Purple is more influenced by classical music
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Deep Purple has faster songs
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The guitar playing in Deep Purple is more complex and technical
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Iron Maiden and Judas Priest do not sound like Black Sabbath at all
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In Rock is a heavier album than Black Sabbath
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Ian Paice introduced double bass drumming to rock
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Deep Purple songs are less monotonous
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Deep Purple has set a record for loudest band
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Tony Iommi himself didn't consider Black Sabbath metal