The legacy applicant pool is probably stronger, since they all come from families with college-educated parents. However, http://www.collegedata.com/cs/data/college/college_pg02_tmpl.jhtml?schoolId=1478 indicates that alumni relation (i.e. legacy) is considered.
Some would question the use of legacy status in the admission process of a public university, since that effectively favors those who already have more favorable conditions (a college educated parent) leading up to the point of applying to colleges.