✔ 最佳答案
Actually, i5 is the best among all CPUs.
While i7 has the best performance, it is also the most expensive. So i7 is used for advanced computing or gaming only.
While Pentium is the cheapest, it has the worst performance. So it is used exclusively for budget computing.
i5 is a balance between performance and price. Also - its performance is capable for some advanced computing and gaming.