I'm happy to give the 12th a miss along with the 2nd and 3rd (and, if I'm honest, the 4th and 7th).
However I'll give a shout out for the 1st symphony which I feel is often under-rated in these parts. I've loved it ever since I first heard it in about 1962 when I was 14yo. That was the famous recording by Ormandy, coupled with the premiere recording of the 1st Cello Concerto all on one very classy LP.
Although the 1st sometimes seems a bit uncharacteristic when set beside the later symphonies, for a recording that gives it the maximum of gravitas try Wigglesworth. For a version that makes it more of a youthful romp, try Caetani. Ormandy sits nicely in between, and I regularly listen to one or other of those three.