Run at +9 and you can improve the s/n ratio 6 db over standard + 3 operating levels. 30 IPS takes those levels twice as good as 15 IPS due to twice the magnetic particles to charge. THD is also lower at 30 IPS.
I always used 30 IPS back in the golden analog days, 1/2" and 2".
Loved the top end, hated the low end, or lack of. Fortunately, this was before 24" detuned kick drums and 5 string basses became popular.
Now days, the PCM4222 ADC is direct coupled so the low end goes to DC. Now I have the low end and the clear fast transients in the high end. I only miss the smell of tape now.