GPA worth differently?Transfer or not?

I am in a regional campus of Pitt and considering transfer to the main campus. If I stay I can graduate from within 1 and half years with a high GPA (4.0 for now). If I go to the main campus which is more competitive, I may not be able to maintain the perfect GPA and will delay my graduation for at least one semester. And I want to apply for graduate school in top universities. Will the GPA from different campuses worth differently in application? Any suggestions?
I’m preparing GRE as well.