Pretty subjective I think... Theres too much going on to call it out all on one single factor. That said longer scale will make it easier and more viable for lower tunings. Its a fact. Sure if you string up a 30 scale bass with really thick strings you could get low, but try playing it. Carl thompson once mentioned in an in depth interview that in his mind the single thing that most affects tone is scale length.
Proudly using Musicman basses, vintage ibanez copies, and custom builds.
Amps: Ampeg b15n + Acoustic 370
Cabs: mesa 1000 + Ampeg Heritage 410
I stomp on EBS, EHX, and MXR pedals.