Congratulations. 4 yr ROTC scholarships are not handed out to just everyone. Much is expected of you. Give more.
You cannot go wrong with any of the choices. I love all the options. I think you are best off with the 4 yr ROTC scholarship- IF it is a good school. Pick one with a strong ROTC program and a great academic reputation. Norwich and VMI are both totally awesome - such traditions! Would be thrilled to see one of our kids have the choice you are having to make.
One thought - if you are seeking a 20 - 30 year military career, go with one of the academies. If you want to be marketable in the civilian world after 5 - 10 in the military go with the ROTC scholarship - unless you are in the south - then go VMI.