Hello,
The question you have asked is a tough question for a stranger to answer. If you are interested in engineering, then choose engineering. If you are interested in architecture, choose b arch. the two disciplines are totally different, except for civil engineering. If you are not sure to choose between civil engineering and b arch, I can help with that. The placements are almost equal for both the branches. When you are considering civil engineering and architecture it is more important to consider taking the course that interests you the most. If you are unable to choose between other branches of engineering and architecture, then the most help I can do is tell you to go through the web and see what all the courses offer and then take the decision accordingly. 
Good Luck!