I applied to both Creighton and Drake, and was accepted at both. I visited Drake a number of times because I live a short distance from it and had the following impressions. The school is smaller than some of the other schools I applied to and has some good opportunities. Their legal aid clinic is very impressive, for example, and the student who gave me a tour said everyone she knows who wanted a spot at the clinic received one. Additionally, Drake's constitutional law emphasis was also attractive. Add in some substantial scholarship money and the fact Drake is in Des Moines (which I like) and I seriously thought about going to Drake.
I did not visit Creighton, although I received an invitation to their scholar's weekend--which appears to me to one of those weekends when they try to recruit potential students who fall in their upper end statistically. Their invitation was not met with a substantial scholarship offer however. Note that Creighton has a graduate who will be serving as a SCOTUS clerk for the '08 term with Justice Thomas. I don't think that will be duplicated any time in the future, but makes me think Creighton might have a larger vision than Drake--which strikes me as very regional.
You are probably aware that in almost every way the two schools are twins: LSAT scores, GPA, employment rates, tuition, etc. If I were you I would base my decision on where I wanted to work after school.