MTT made a big splash when he arrived on the scene, but I'm not generally a big fan of his recordings after the early years. Although, his LSO/RCA remake of "The Rite of Spring" improves on the (impressive) BSO/DG in every way. I have never been a fan of his Mahler, and the only recording I own in the SF series is M6. I've never liked it, but it has yet to land on the out stack.
Conductors like Blomstedt do excellent work, but don't aspire to superstar status even if their performances/recordings deserve it. His Beethoven set from Dresden (Brilliant Classics) is very solid, and an incredible bargain. His Bruckner 4 from SF is the only recording I've heard that equals, perhaps surpasses, Bohm/VPO for horns that really peal forth in the Scherzo.
Also, it seems to me that orchestras often have their preferred roster of guest conductors and don't like to think outside the box. I've heard Stanislav Skrowaczewski three times in Minneapolis, all superb concerts, but I don't think he's been here in Chicago for many years.
OOT, I decided to hear the CSO tonight in a program of American music with Leonard Slatkin (Barber School for Scandal overture, William Schuman S6, a new violin concerto by Mason Bates, and An American in Paris). I like the Barber, the Bates is sort of fun but I think overextends its thin material, and the Schuman was by far the most interesting piece on the program. The Gershwin I don't need to hear more than once a decade or so.
My enthusiasm for Slatkin has grown in recent years. He stepped in a few years ago on short notice to do an M6 here. I had low expectations, but it was excellent in every way. I buy the RCA/St. Louis recordings as I stumble across them, and it's an impressive body of work. Most surprisingly of all, tonight he made Orchestra Hall sound good, something few conductors can manage. He presents a lot of neglected repertoire, especially American music.