Because of what you have written, I'd say Adriatic, hands down. I've done both tours and while I did love the VI tour, (caveat: I have spent quite a bit of time in Italy) and it offered a whole lot of experiential and fun adventures, the Adriatic was by far out of my "wheelhouse" and quite a wonderful education. Of all the history in Europe, for me seeing in person and hearing the on-the-spot history and personal local guide stories of what actually happened during the breakup of Yugoslavia and the Bosnian War, (but also some WWI & II history thrown in as well) were more relatable to me as I can remember when the former happened. Of the 22 tours I have taken, this one really hit me emotionally, especially the visit to Mostar. The tour is all this, and more "...exotic, a bit more off the beaten path, at least for most travelers. Plitvice, Bled, Ljublijana and Korcula all look beautiful as destinations, and it seems like this tour will have more of a cultural connection, especially in Bosnia. ". You described it better than I, who have actually taken the tour, could. We went in early May so not too crowded and the weather was perfect, except for the Plivice visit, which is another whole story.....But nevertheless it was awesomely beautiful with all the rain in Central Europe that Spring. And I loved our guide who actually personally experienced a lot of this history, as I think all who guide for this tour have. Whichever tour you choose, it will be the right one for you. Go with your gut!