Ableton Live will get you where you need to go, with or without a controller.
Ableton Live, is for all intents and purposes many times more powerful than the OT. I mean really, it is basically limitless especially now with a modular like interface built right in (MAX).
Ableton is however, extremely scientific compared to the OT.
I literally have happy accidents every time I work with the OT because its a machine for exploration rather than scientific workflow and outputting masses of music. Never really had that happen with Ableton and plugins…
What I mean by all this, is that on paper any software choice will destroy the OT. It really is more about the in the moment usage of the machine that will tell you the true differences. In that sense, no piece of software will ever be enough. Even touch interfaces like SAMPLR (while very good) feel lacking, although they are getting closer