All these things have different purposes, markets, users they are aimed at:
Axoloti has pretty limited hardware but makes very good use of it due to using a RTOS (Chibios) which is why the latency is so low. its ideal for building your own stuff… but yeah, if you just want to plug n play thats hard for some. (axoloti control may change this ) … what you get for 65 euro, is great value.
Organelle is nice for a grab and go device, whilst PD makes it accessible to lots - frankly, its also damaging its performance reputation - native FX/synths would yield better results.
its a compromise though. I think it does a good job… one thing, swapping out the SoC ( = cpu) is trivial (undo 6 screws!) and cheap - I changed mine to a quad core with 4 times the ram.
Bela is somewhere between the two , proper RTOS and decent IO , but mainly its being used by techies, so no patches for musicians to use … aimed more at instrument builders - this might change when the eurorack option is added !
then we have Zythian/Mod Duo/PiSound/Owl … all other options, all with their own benefits
( I recently starting using the PiSound running Modep, and its fantastic , I run my Organelle into it)
Its a great time, we have so many choices, and looks like we are set for a lot more…
back to Zoia ,
I dont think is comparable, there is zero indications that the modules are going to be replaceable by the user.
(we dont even know if the firmware is going to be open source either , do we?)
see this screenshot from Empress
notice how its a fixed list of modules and its C++ code. no indication of dynamic loading…
i.e. it looks like the firmware is contains the modules , so a bit like the H9
so basically its a bunch of modules that can be connected ‘easily’ via the grid (which represent the input/output/parameters of the module) … if its really easy to use, it’ll be great.
(I do think that LCD is too small though )
having been playing with Axoloti/Bela/Pi/Organelle, its made me appreciate a good hardware UI, and its really nice to have a few boxes I dont have to write code for… I can just pick them up and play them