I chose 3, listening to it as I type. It has amazing dance rhythms and beautiful transitions and great buildup. The C#m section is just??? and everything is basically in another world. I actually have a playlist just for this amazing piece (35 interpretations of it. I've listened through it like 5 times. I like Arrau's the best.)
My second favorite is 4. It's quite a mature composition. Really meditative and remarkably contrapuntal, too. Beautiful in so many ways and also involves great buildup. The beginning motif sings and I don't get tired of it after 13 mins.
After that, I'd say 1. It's THE signature ballade and the first one to ever be created. There are many elements about it that just work, and while it's quite generic for a ballade, I'd enjoy it and listen to it any day. It also has that "feel-good" aspect that I look for in all music.
I honestly don't like 2 all that much. While the beginning is beautiful, the Presto con fuoco part just seems show-offy. It repeats a bunch too, and has awkward transitions. The coda's basically just a restatement of the awkward, crazy 2nd theme. Despite this, I like the big pause between the 2 motifs and Richter brings it out really well.