For me, across all of them only two felt actually decent for a bank note (B & E, I is okay, just not used to bank notes in that orientation, same for J, but that one should be more monochrome). Either they were too vibrant or the design was too busy/had unnecesary elements. I also feel like the notes that had buildings (like we have now) are just.. better. The initial run of 2002-2013 remains the best aesthetically,…
I prefer the Birds & Rivers theme because nobody is expecting a specific bird to meet some arbitrary ideal whereas if you put identifiable humans on a banknote people start to mistake their inevitable flaws for a desirable property. I feel this more strongly for statues, but it seems desirable for the Euro or any potential international currency too.
For reference, the two previous runs at the top of the page: https://en.wikipedia.org/wiki/Euro_banknotes