Hi,
B.Des is a 4 years and B.Arch is a 5 years course
BArch involves a lot of technical knowledge and skill with field work and desk work both

BArch requires inputs and knowledge of physics mathematics as you will be dealing with designs, calculations and evaluations.

Both are rewarding creative careers,in either case you have to understand your potential and intrest if you like technical plus creative work with alow of site work then B.Arch is for u, but if you like desk work with more creative insight then go for B.Des