'Whose' and 'Of Which': How Punctilious is Too Punctilious?

Which of the following is correct?  'He presented an argument whose logical form is Modus Tollens.'  'He presented an argument the logical form of which is Modus Tollens.' 

The second.  But it would be absurd to insist on a punctilio such as this in a world going insane.  Besides, you are not going to write, 'An idea the time of which has come' are you?  No, you will write, 'An idea whose time has come' despite the fact that time is not a person.

For your goal is to communicate with your readers, not distract them with your schoolmarmish scruples.

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