Question: I have decided to switch from Window to Linux.
Should I use Ubuntu or Kubuntu?
Or there are other handy alternatives?
I'm a LAMP based developer.
Any help would be appreciated.

Answer: 
The two use different environment. Ubuntu is Gnome , and Kubutu is KDE.
<http://www.psychocats.net/ubuntu/kdegnome>
I think both have a live cd, try them out and figure out which one you like better. There are tons and tons of choices, which one works for you will be 100% up to you. Basically you are asking about gnome vs kde, which is a basically a religious war :)