Assuming you don’t currently have these machines, id say a few things to consider-
OT- bit of a learning curve, you’d want to allocate a fair bit of time to get comfortable with it on its own before adding stuff to it
A4- ditto
Push 3- to me it’d be overkill having this/Ableton and OT together. Would make a lot of sense (to me at least) to settle on either this or OT but not both
Korg Wavestate- never used one IRL but had/have the VST and it was fairly deep when I could be arsed to use it, But probably cool in whatever setup EDIT: I had the OPSIX and while I didn’t much like the build (felt a bit cheap) it was pretty immediate and fun to dial in sounds on the fly
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