I once found a 75-disc set of the complete Toscanini at a garage sale and bought it for maybe $20. Edgy? I suppose. They're certainly out of tune. Toscanini had a habit of picking absurdly fast tempos, so many of the records are sloppy as a result. It's also the epitome of non-informed, 20th century schlock. Bach, Mozart and Haydn all sound like Verdi.
Toscanini's opera recordings are very interesting, though still prone to the same problems as his orchestral work. It's nice to hear what La Scala and the Met were like around 1940 and 1950. He had personally known Puccini and Verdi, so I suppose his recordings are as historically informed as could be.
As for Karajan, that's another can of worms. As long as I'm disparaging long-dead conductors, I'd like to point out that a great deal of classical music's current "image" problem could be traced directly back to Karajan. He was essentially the face of European orchestral music for a generation, directing both the Vienna and Berlin Philharmonics simultaneously. He put out an absurd number of recordings, none of which are good. He had a talent for taking a rather shocking piece like Beethoven's 3rd symphony, rounding the edges and turning it into easy listening. It's no longer revolutionary, exciting music -- Karajan's recordings are meant to be enjoyed in the background, while you sit in an armchair and read a book. I ****ing hate Karajan.