Really, we almost have 3 Cycles of Symphonies. The two on Ondine are both superbly recorded (in House Style); I don't know the BIS, but you know their sound is usually quite big and expansive (sometimes bordering on the 'too much'), so I don't know if that will help or hurt detail; and, the layout is kind of sprawling.
Either the Berglund/Ondine, or the Sakari/Ondine recordings of Symphony No.4 should probably be the way to go. With Sakari you also get S3 and the Cello Concerto (an absolutely great programme) and with Berglund you get S1 and the wonderful piece for Harpsichord and Strings, '...durch einem spiegel...'. Whether you choose the CC or this piece, you'll probably want to end up getting both.
Berglund's Finlandia recording of S3 is much darker than Sakari's, along also with the CC, so, his vision is a great compafre to the more extrovert and 'pleasing' Sakari.
I also have the early Piano Quintet, which deals in the same shifting 4ths and 5ths, the expectant atmosphere, the early Serialism. (Symphonies 1-2 are from the earlier Serial Phase- the later works have more of the stamp of an Individual).