Attachment shows positives from 0.1 in squares of Tri-X negative (photos of a gray card on a black card) developed in Rodinal:
1:100 minimal agitation 27 min 68F agitate every 3 min.
1:200 stand 90 min 68F
The edge effects,visible as a lighter line on the gray side of the gray/black border, are less for minimal agitation but the grain is also smaller and ,of course, the problems with streaks at the ege of the film (can't see that here) are less.
I guess different people with different developers and tanks have different preferences for this.