Okay so here's my take:
The University of Kentucky COM is ranked the better medical school and that has been established and in UofL SOM has lagged behind in investing in their medical students, but they've taken action to fix all of those
Everything MrsApache said is correct about UofL almost losing accreditation but I had many friends that were in ULSOM during the probation period and they told me that Louisville immediately took steps to improve its curriculum and spent many millions to revamp the entire medical school so a lot of the things top notch. I personally wouldn't let a past problem be too much of a deciding factor especially since that is the first probation in the school's history according to the article. It's still something to think about though...
UKCOM-BG is a wonderful campus and its a satellite campus of an amazing medical school. The only downside about it imo seems to be due to the fact that it is a brand new campus and you will inevitably experience some hiccups due to that. Also, someone please correct me if I'm wrong about this but I heard that some of the classes will be taught online through live video which I am not too big of a fan of. Also being the inaugural class is awesome but it comes with its own problems with not having any previous classes to ask for advice. That's just me being picky though. During my interview in BG I asked about this and they admitted that being the first class comes with its set of problems but they are going to be working extra hard to Iron out any problems as quickly as possible. They also told me that there is no preferential treatment towards either campus(that was obvious but just thought id throw it in there to be fair). The smaller class sizes are a huge plus to me because it's more personalized teaching and you get closer to your classmates which I love
When it comes to which school you want to go to I would just say the one you felt most comfortable with on your first impression and if you need to I'm sure both schools would be more than happy to give a second look to help you decide. Again this is all my opinion and things that I didn't find very significant you might weigh heavily so it's totally up to you. UofL is officially out of probation the last I heard and UK is overall the better medical school. I have only been accepted to one of the schools so far so my decision has pretty much been made up for me

haha. If I end up getting accepted to the second one I'm going to have a super tough decision on my hands. Location is also pretty important to me because I am a Louisville native so staying near home is nice.
Sorry for the super long post but I had some time on my hands over summer break and thought id share my thoughts on the topic.

Whichever school you end up choosing I hope it's for the best. Good luck! (excuse grammatical errors I'm too lazy to proofread haha)