Kindly refer the i3-3220 vs FX 8350 benchmark from anandtech website.

Believe or Not , Click HERE !

Im planning to upgrade my CPU but which one better ?

i3-3220 2core/4thread and FX8350 8core/8thread , anandtech show that i3-3220 more powerful than FX8350 ? is that true ?

Hmm~~ Normally I wouldn't care much about the benchmark tho. Yes it provides a clearer view about both comparison but in real world usage? You might not notice the different.
Aside from that whats ur purpose of your new rig?
Seems from the comparison itself the AMD would do better in most of all
Where as Intel I3 excel in single threaded applications.
I would stick with AMD tho if you are only going to choose between these two.
End of the day its up to user preference.

Thanks man, i know what do you mean.. U remind me my first time build pc. haha really THANKS you man..