which should i start( php OR asp.net)?

.NET is more object-oriented than PHP (so, in programming paradigm .NET is better), but if you are going to spread your web-application on your own web-farms you have to buy licenses for all machines with Windows Server. Nevertheless, with clouds coming up, these problem partially will be solved.

I agree.

PHP was more popular because every webhoster supported php (IMO the main reason is/was => it's free)

c# is OOP
php CAN but isn't required to be OOP, so it's IMO easier to learn it.

I learned c#, visual basic in the school and in my job, but i prefered php because forums became my hobby and i had to learn it.

Now i'm sticking with php because i'm much more familiar with it.
Sometimes i miss the good old days, because the .net framework has provide many great things (e.g. classes) which aren't available in php. You need to code it yourself or choose one of the many available frameworks.

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