Which is better Intel Pentium or Intel Core i7?

As basically I will Intel Core i7 is the best one, because it covers the latest technology which is use full from high end media encoding and decoding, high end games and graphic design.

if you are a first time user on the desktop or laptop I suggest you to take the Pentium which is worth for your usage and many more things you should consider while buying Intel Core i7. As you feel that after buying you got the latest technology but the question how much you can use the Intel Core i7, does that much high end is required my usage? and ask yourself a question regarding this?

If you are a basic user of using the small applications like office, internet usage and games(small games) you can go for Pentium, actually let you know that Pentium has also got 3rd generation technology as like Intel Core i7 but cannot beat the performance of the Core i7. 

You may research in the Internet where the processor Core i7 needs, at what point of time it is useful to a desktop user?

Let me suggest that Based on the usage you can take the desired processor that which fulfills your needs.