@bloodstrike11 getting into a top medical school in the US is very difficult to begin with, but it is even more difficult for international students, since US med schools tend to have rigid quotas on the number of non-US students they accept. For med school the main things you need to have is a really good GPA, strong MCAT scores and also good research experience helps a lot. As an international student your GPA and scores need to be near perfect to have a good chance at a top US med school. Both M&T and LSM are truly amazing and unique programs but they are also extremely rigorous so keep that in mind given your pre-med plans. Out of the two I would probably suggest LSM. Biology is probably a bit easier than most engineering degrees so you have a higher chance of a better GPA. LSM is also about half the size of M&T so there is even more individualized attention. Also LSM is super good with providing its students with life sciences summer research positions which could further bolster your med school application.
Also Penn in general is very good at providing its undergrads with top research opportunities, since the med school is right on campus and it is one of the very best in the country and Penn undergrads have great access to research opportunities there.
Hope this answers your questions.