I have actually seen no difference in the freehand vs the “dots” stroke type for mesh sculpting in 3.5 . In 3.1, there was a distinctive difference, but no longer. I illustrated the difference in the following post:
http://www.pixolator.com/zbc/showpost.php?p=611726&postcount=113
@OP, yes, many people agree with you. I myself didn’t see the difference at first when just doing simple tests with my mouse.
But now that I’ve done a number of in depth sculpting projects with my Tablet, I can definitely say that while 3.5 has superior performance and max poly potential than 3.1…it is noticeably inferior to 3.1 in how quickly the strokes break up into “dots”, at least while working with the tablet. There have been a number of threads on this.
Whether it is actually a “lag” issue, or some sort of velocity/spacing/tablet input difference is unknown. There is currently nothing to be done that will significantly improve it, other than to work slowly, or use Lazy Brush (Lazy Brush seems to be a different animal, and actually has exposed settings to further improve spacing).
Hopefully we can see this aspect of Zbrush performance restored to what it was in a subsequent update.