Lee was loved by both the North and the South. At the end of the war he was instrumental in stopping several plots to continue the war. He simply appealed to the honor of the men and they followed his lead. Lee did not believe in slavery and owned no slaves. Grant, on the other hand, owned 2 female slaves, acquired before the war, to tend his ailing wife.
Lee was, at best, mildly opposed to slavery and owned slaves much of his adult life. He was a supporter of emigration of freed slaves to Africa and paid passage for some of his own slaves that he freed. As executor of his father-in-law's will he was emancipating slaves as late as 1862. As late as 1865 he was still describing slavery as the best condition for blacks in the South.
Grant, on the other hand, owned 2 female slaves, acquired before the war, to tend his ailing wife.
Grant owned a single slave outright for a brief period in 1858-59. He emancipated the man when he moved to Illinois. His very healty wife had the use of as many as 5 slaves during the course of their married life but most evidence indicates that they remained the property of her father. In any event they were freed early in 1863 along with the rest of the Dent family property. Grant, on the other hand, owned 2 female slaves, acquired before the war, to tend his ailing wife.