I think on current form and how stable and confident they are as a group, they are comfortably better than Porto is atm.
I think they are more like Aston Villa or Arsenal IMO. Plus the motivation factor should not be underestimated. They will try to waltz us from minute 1.
However, I fail to see how the conditions are in their favour only. Weather is dry and warm, ideal conditions for both sides but not humid enough to give palmeiras an edge
Sure their fans will be in the majority but it is not a huge stadium and also no good accousitc. In general am a bit disappointed how the quality of stadiums is so poor in such a rich country.
A small advantage for us is that we played in the same stadium the final is contested already, while they played in a smaller one with different pitch measurements. Needless to stay their flight was a lot longer than ours.