And it's why all of the historians interviewed in "North and South" magazine recently, all voted Grant #1 in the "Top Ten Generals" of the Civil War.
There are fashions in history as well as clothing. Historians of other periods would have reached different conclusions, and in the future they may do so again. Although a Southern partisan and despite the fact that Sherman burned the family home during his Meridian campaign, I believe Sherman was head and shoulders above Grant as a military commander. Of course my grandfather would have washed out my mouth with soap for expressing anything good about either.
No way was Sherman head and shoulders above Grant as a military commander, in fact, Sherman wasn't all that great, and he commited many tacitcal and strategic blunders. He only ranks #3 on the "Top Ten Generals" list with three out of six historians and even lower for others.
Sherman is overrated overall, though still next on my list next to Grant as far as the Union went. George Thomas is someone who is not often rated as highly as he should be, too.
Don't know what fashions may come down the road, but I'm a whole-hearted Grant adherent. I think he was head and shoulders above anyone on either side of the war, and in that, at least, I'm in good company with present day historians.