I dunno if Trump lies more, but his lies are more obvious, stupid and pointless.
When Clinton said he did not have sexual relations, he had wiggle room that he didn't stick his dick in her vag, he just frigged her off with a cigar while getting blown, then came on her tits.
when Bush said they weren't torturing prisoners, he had wiggle room that they brought in a scientist to determine exactly how many minutes of being waterboarded constitutes 'torture' then made sure they stopped 10 seconds before that number.
Most politicians under oath will say "not that I recall" or similar, so they have wiggle room that if they're caught red handed they can just claim they forgot they did it.
Trumps just like some fucking kid with his hand in the cookie jar and powdered sugar all over his face saying the dog did it