Well some laptops come with an option of an 'm3', 'i5' or 'i7'. On the internet you'll see lots of people saying the the i5 will crush the m3, however all of those three processors are identical with only a 200 MHz clock increase between them (15-20% performance increase in practice).
I guess the OP is referring to the confusion between the 'laptop' m3 and the i7 that you can get in a desktop or laptop.
