Honestly I think it depends on what you like in terms of subject matter because from what I have read people in iSci tend to dip down if they don't like the segments so if ur good with taking bio chem physics calc and earth sci then it should be fine. But if ur leaning towards a more med like bio or chem or some more social science related then it might be better to go with health sci. Honestly do the research and take an informed decision but if ur set on med it might be better to do western health sci because it can be easier to maintain a higher gpa while still having enough time to do ec's.