Claiming that one conductor has access to "deeper musical truths" over others is such absolute inane silliness that anyone who espouses such a claim deserves to be slapped about the head and face until they cease and desist. :lol:
Some prefer one conductor's approach, others another, and that's it, except that the conductor typically gets more credit than they quite deserve. It's all just taste, simple, banal taste, with or without attempts at justifying the preference, with or without employing vapid rhetoric or empty pseudophilosophy. In terms of the latter, I prefer without.
I like Szell's recordings. I like his better than Furtwängler's, because I find the latter to be on occasion sloppy, boring, and predictable. YMMV.
Who knows which of the two I'd prefer to play for. I'll never know.
(ETA: disclaimer, I'm not really advocating that someone who makes silly remarks on a classical music message board should be harmed physically. Er, probably not.)