Question: what is the difference between i3 and i5 5th generation?
Answer: The i5 is anyday miles better than an i3. 5th generation focuses on lower power consumption and hence, there isn't much performance differences. If power consumption matters to you, then you can think about buying a 5th gen processor. However, a 4th Gen i5 is anyday better than a 5th gen i3 (if it exists).