Some misconceptions here. Bruce Catton was never an academic. He was a writer and reporter and the founding editor of American Heritage magazine. He had an excellent serious magazine style that contrasts with Foote’s more literary, novelist style, but definitely not at all academic.
He also wrote two major Civil War trilogies. The first was the Army of the Potomac trilogy: Mr. Lincoln’s Army (1951), Glory Road (1952), and A Stillness at Appomattox (1953). This of course concentrated on the Virginia theater, and was north-biased. It made him a superstar in sales.
The second was the more comprehensive Centennial History of the Civil War trilogy: The Coming Fury (1961), Terrible Swift Sword (1963), and Never Call Retreat (1965). This is not quite up to the level of the first, since it tries to cover more political and social issues and those aren’t his specialty.
There is in fact a third trilogy, about Ulysses S. Grant, and a number of other books on the war. He wrote a couple of the major American Heritage histories of the Civil War and those were top-notch for the day, although 50-year-old research on the war has been superseded in lots of ways.
Foote’s books are not exactly neutral. They were written deliberately to balance out the northern bias of Catton and others. In total, they are pretty even-handed but he spends time trying to straighten the record, as he saw it.
For me the big problem, pun not intended but I’ll leave it in, is the sheer bulk of Foote’s trilogy. After it became famous the section of Gettysburg was published as a small independent book. It’s still 250 pages. His emphasis on blow-by-blow battle accounts makes him popular, I admit, but I find that once you take out the battles, what’s left get slighted in a number of ways, not all of them due to his writing before the post Centennial surge in Civil War research from a variety of perspectives. Studies of slavery didn’t really exist when he was doing his research compared to the enormous volume today. And the whole field of looking at the economic, industrial, technological, and bureaucratic underpinnings of the war, now thought to be what really won for the North far more than the battles themselves, was also almost nonexistent.
To be honest, I wouldn’t recommend either history today unless you’re looking for battle porn. There must be newer works that incorporate this newer scholarship, though I admit I haven’t kept up. Looking at the History Book Club’s Civil War page, I see mostly books that concentrate on aspects and pieces of the war. Comprehensive histories may be out of style. I do second Elendil’s Heir for the recommendations of McPherson and Ward.