Galaxy vs. Apple

I use Samsung phones since 2008, and all my phones become buggy after 2 years.
My friend use only aple phones, and he have Iphone5 since 2011, and it's work like in 2011!
Why this is happend?
Becouse samsung uses cheap parts for they phones. (Processors, camera,..)
But apple MAKEING it's own parts that are 100 times better and have better quality.
So if you ask me, buy any apple phone and you won't mistake.