Welcome Pierre 
Lots of good answers here already, so the one thing I’ll add is: If you end up deciding an Elektron is the direction you want to take, accept that it may not be able to do everything you initially envision, and choose the one you feel most inclined to spend a good bit of time with.
Elektrons are fun, deep and capable, but they demand patience to learn their workflow, which some find idiosyncratic. So listen to lots of demo tracks and start with the one that makes your ears happiest. 