Argerich plays the best Sonata Op.58 , i don't know her 2nd one though
For Op.35, go with Horowitz, Richter is not bad neither.
I have the video of Pologerich playing Op.35 and Op.58 complete both, it's awesome. But i take some points out for him not playing the movement 1 of the OP.35 fine enough. But it's a 95/100 performance
I have Gilel playing Op.58 live too, it's awesome.