They are both excellent schools, though different from each other. Why don’t you take a look at the course requirements at each school? Since Bucknell is a liberal arts university, I am guessing it draws a more well-rounded student body, and has more required courses outside of engineering. If that appeals to you, then maybe that should be your choice over the two. If you can’t decide, apply to both. The RPI application is pretty minimal, and they do not do interviews.