I love all opera (well, with exceptions) but my primary love is the symphony and orchestra music and in the vocal world oratorios and, yes, operas, but I would be lying if I said I remember all arias by name. Though I have heard all the operas you listed, the only aria I recognize by name only (can't play the videos right now) is Der Holle Rache from Die Zauberflote. It's glorious and I voted for it. I may give more of an opinion later when I can actually play the videos.
I'd say though that arias for coloratura soprano from the baroque era in my ear sound more difficult than anything else. I love baroque opera almost above all (mostly the music, the librettos not always really).