I can post an explanation of my vote shortly; I think that would be fair given the results.
So I knew this match was coming and initially suspected that Bronx would be the favorite, given its numerous large, beautiful grassland paddocks. However, a few came out swinging for Vienna and had some really compelling arguments in their favor. I actually spent most of yesterday and today thinking I would vote Vienna.
The first thing about Vienna is that in Deserts, I think it probably wins. The degree to which that biome is represented and the conservation work noted for desert species, along with Bronx's respectable but not particularly noteworthy competition, made that pretty clear.
The second thing about Vienna that I really liked is how good some of the *indoor* enclosures look. Realistically I'm sure many European zoos have to keep their animals inside often, or at least give them the choice; choosing to invest in such large and well-designed indoor spaces is therefore a commendable choice, especially when options are limited for the outdoor dwellings.
However, after today's additional posts from
@ThylacineAlive about miscellaneous Bronx attributes, and especially after
@TZDugong reminded me of the staggering support that the zoo gives to conservation, I leaned slightly back into the Bronx camp. I still like Bronx's outdoor enclosures a lot more, and it didn't fall far enough behind Vienna anywhere to overcome the conservation bit for me. My personal feelings are aligned closer to 4-3 or even 5-4 Bronx, but considering how close the vote was going to be already I didn't feel too guilty about my own margin.