Which 50mm is better for a photowalk?

The elmar. The only reason to use the Nokton, with all its disadvantages, is because you need to use it at either its full aperture, or at apertures wider than f/2.8. At the subject to camera distances commonly encountered in street photography, depth of field at f/1.1 is too narrow to be of much use. So, it's no contest. Elmar wins, hands down.