I think you have mistakenly written BF Tech I think you want to know the difference between B Des. and BTech.

basically BTech is an engineering degree which is offered to the students to learn engineering in complete their courses of Engineering, while bede's is offered to the students who complete courses on design there is big difference between these two degrees in terms of difficulty BTech is more difficult compared to be days but if you look on the job opportunities then B does have advantage.