Since you are interested in CS and IT I would recommend you to go for CS as top priority and then consider IT. Both these fields are in demand but the only difference between is that IT deals with application, maintenance, networking and database storage while CS focuses on writing programs for software as well as hardware. Top priority should be CS because you will be able to learn both software and hardware. Now BTech stands for Bachelor of Technology while BE stands for Bachelor of Engineering. BTech is more practical and hence it is more professional than BE which focuses on theory.