Always been into 5 strings since I was a nu-metal teenager 25 years ago, and this has not changed. I've had pretty much every popular 4 string going and always find myself going for something more modern (and 5/6 string), the 'traditional basses' just don't work for me overall. Although I do have a P with flats for occasional use.
I am a total fanboy for Dingwalls so am going to big them up, however that is BECAUSE of the B string. For clarity and harmonics, I think nothing beats them.
I had both briefly. The JT definitely covers some sounds but due to scale length and pickup type/positions does sound different.
Would both be beneficial ? Not in my opinion if just about tones - the JT can do similar sounds but obviously has a very different feel. If you want a shorter than 37" scale for 'easier' reaches then yes, it could be useful.
n.b. I kept the SP1
Kind of, but they won't fit your EHB. Dingwall's are rounded and there's a sweet spot for anchoring.
https://www.bassdirect.co.uk/product/dingwall-fd3n/
Great bass - had this exact one before you. They don't come with this switch stock, but it definitely opens the sounds up to make it even more versatile.
Subjective experience is totally valid.
Mine is that unless it has at LEAST a 35", the B string lacks clarity/harmonics. I have also had 35" basses with a mediocre B however, which does suggest the scale length alone is not a guarantee.
Had my SP1 almost 2 months, the B string is outstanding (just not quite as good as a 37), however the multiscale means the higher strings still have warmth and aren't at all 'pingy'. I still have my D-Roc for the heavier side of things.
Supply and demand, i.e. D-Rocs are readily available. The Super P is new, more traditional and has sold out immediately, thus price increases are a safe bet for retailers (as well as some of the price increase being at source of production).