I had the Barenboim B4/B7 twofer and the sound is awful. It's grossly over-resonant, not unusual for DG CSO recordings of the era.
In B4, I have never heard horns in the scherzo as clear and precise as with Bruno Walter and the Columbia Symphony, though Bohm/Vienna comes very close. The sound for Walter is dated and somewhat brittle, but I wish a modern recording could equal those horns.
I also like the Dennis Russell Davies recording of the original B4, in which the scherzo is completely different. Although the commonly heard version is slicker, the climaxes build more organically in the first version, especially in the finale.