Is there a big difference between zx and a B1 with glass bowl (with heatsoak) for taste and density of the clouds ?
If I can give you one piece of advice it's to buy a ZX.
You absolutely won't regret it!
It's much better than a B1.
I have recommended the ZX to at least 4 or 5 people since 2023.
And the irony is that these people vape with a B1 injector. Because in my country CH vapes are easily available and quite popular.
They all sold their B1 shortly after receiving their ZX.
And if you've been considering buying the ZX head separately, grab the Zbol with it.
It's essential for me.
I use my ZX with several types of 14mm injector bowls.
A ss SKO bowl, a titanium bowl from B2cvape, two wooden bowls, one made by OWW and the other by defreez.
I also have several glass bowls.
All these bowls work very well with the ZX, but I use my ZX 95% of the time with the Zbol

It's simply much better and so good.