I'm surprised nobody has mentioned Otto Klemperer. His stoic and some would say 'architectural' approach is congenial to Bruckner's music. His 1960's recordings of #4, 5, 6 & 7 on UK Columbia are the ideal representation for me and the sonics are generally excellent (on original vinyl, can't comment on the digital transfers).
Unfortunately his tempi became erratically slow in his last years and his HMV recordings of #8 & 9 suffered from this. Here my choice would be Schuricht on HMV for both symphonies and Walter on CBS for #9. Klemperer never recorded the first 3 symphonies. While I don't care much for #1 & 2, I do regret he never did #3. Szell on UK Columbia and Böhm with the VPO on Decca are great alternatives with great sonics (again on original vinyl).
P.S. I'm not a big HvK fan either, but his last live recording of #8 on DGG is rather special.
Unfortunately his tempi became erratically slow in his last years and his HMV recordings of #8 & 9 suffered from this. Here my choice would be Schuricht on HMV for both symphonies and Walter on CBS for #9. Klemperer never recorded the first 3 symphonies. While I don't care much for #1 & 2, I do regret he never did #3. Szell on UK Columbia and Böhm with the VPO on Decca are great alternatives with great sonics (again on original vinyl).
P.S. I'm not a big HvK fan either, but his last live recording of #8 on DGG is rather special.