Which is better b.tech or b.arch?

Dear sir, i am sachin and studying mechanical engineering in gaya engineering college which is a govt engg college. I have taken admission in 2010 through BCECE 2010 and passed my 12th exam in 2010. I have secured 2978th rank in Aieee 2011 in b.arch. And i have got NIT PATNA in 1st round seat allotment. Now i am confused what should i have do, continue my study in gaya engineering college or to take admission in nit patna in b.arch. Please tell me as fast as you can bcoz i have not 2 much time.