If you weren't considering Penn State after getting admitted to UTRGV, why didn't you withdraw your application to Penn State?
If you have the time and the money to travel to Pennsylvania, go for it. It will give you an idea of what another school is like. There is no guarantee that you'll be offered admission there but the experience of traveling and being interviewed may be helpful down the road.
If you don't have the time, money or inclination to consider matriculating at Penn State, save everyone's time and withdraw your application immediately.
The quality of US medical schools is policed quite heavily by a group known as "LCME". They won't let UTRGV operate a school that isn't going to be able to match graduates into residencies. It should not even be a consideration, IMHO. Far more depends on your Step scores and your performance in school than the school you attend.