Neither...add them to primary after fermentation starts to slow down. You can dissolve them in a small amount of boiled, mostly cooled/still warm water. Two advantages: 1) you will retain more flavor this way and 2) lower OG for the yeast to deal with when starting. I do this with my vanilla/oak/bourbon porter (that also has molasses) and you can taste the molasses much better than when I used to add it at flameout. I have done other beers with late honey or other sugar additions, and always successful...