W. Fowler: 'Compare', in the sense 'suggest or state a similarity', is regularly followed by 'to', not 'with'; in the sense 'examine or set forth the details of a supposed similarity or estimate its degree', it is regularly followed by 'with', not 'to'. 'He compared me to Demosthenes' means that he suggested that I was comparable to him or put me in the same class; 'He compared me with Demosthenes' means that he instituted a detailed comparison or pointed out where & how far I resembled or failed to resemble him.
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