Update: Woohoo, #2 was also a good interview experience! It's always interesting to interview back-to-back with different companies for comparison. The great thing about both of them is that they seemed very interested in me as a candidate, everyone had obviously read through my resume as they had some specific questions about past positions, and I was able to meet with several members of the main team I would be working with in each company. Also, both companies seem to have great opportunities for long term growth in areas I'm interested in starting from the role I interviewed for. Again, I was enthusiastic, positive, but also honest and (hopefully) informative, and felt like I've given my best to both interviews.
I have a hunch (based on location & company culture) that one of the companies might be a *slightly* better fit than the other, but honestly if either one made me a job offer within the salary range I'm looking for, I wouldn't hesitate. So we'll see what happens. I'll keep YouLookFab posted for sure if I receive & accept an offer, or if any other interview opportunities come up.
Thanks for wishing me luck, Angie, MariannaCecile, and Inge! It is greatly appreciated.
P.S. I changed up my interview outfit slightly for the second day if you're curious.