Does your professor believe in "trick" questions?
The simplest and most correct answer is "Intel Architecture" for both families for processors you mention as compared to Power, or AMD or RIS processors.architecture
Within the 2 processors families there are a world of differences and each have some unique architural instruction sets and micro achitecture.
The processor data sheets go into detail
however, this page gives you a much quicker comparison of the major micro architecture features.
He may also be looking for the shift to QPI in the i3/5/7 framily which complety changes the old front side bus configutation.