Sign in Pop up style, or page style.

which is good? and why?

if is pop up style, than it seems interactive it means user can more experiences funny things. 

in the other hand Server side can't add a ads banner, so there is small oppertunity to earn a money by showing some ads to users.

is conclusion which should i have to chose?

i like popup style. and also i can do above profits in register processing.

so i decide to popup signin.