Its hard to say which group of UG is more friendly to premed. IMHO, premed is a difficult subject and it is hard to enter a med school anywhere you go. The general rule of thumb is that if the applicant is in the top 25% of a University’s entering class, chances for this applicant succeed in med school application is much higher. The higher level of UG, the less chance to succeed as a premed, because of the competition is much tougher in a top school. OTOH, there are plenty top UG school graduates got into top med school, if you check with the profile of a top med school student profile, 60-70% of those med school students are from top UG schools.