I own an LG Viewty: should I buy an Apple iPhone?

My brother decided to get himself an Apple iPhone, so he decided to give me his LG Viewty well he must have felt sorry for me as I had an old Samsung D600. I must say at first I had a little trouble getting used to the touch screen on the Viewty, but I think I am starting to get used to it now.

The thing is I still miss my D600, I think it has something to do with the menu it is much better on the Samsung than it is on the LG. Well now I have had to listen to my brother going on about how fantastic his Apple iPhone is, and that has now got me thinking.

Should I stick with the LG Viewty, or should I go and spend some money for a change and purchase an Apple iPhone?