For example Ginseng Roots. The epic ones offer 1225 to each stat, whereas the legendary ones offer 6% to each stat. Obviously a low-level player will want the epic ones, as 6% of their stats won't amount to much. But at what point, at what number of stats, do those 6% become more than the flat 1225?

Note: as you can probably guess, I mostly care about the Ginseng Root, but feel free to add information regarding the other boosters as well, if you want to make the answer more informative.