Yeah, that comes from making music in the early 90\'s ... imagin having only 4 tracks to work with ... that\'s all my first copy of cubase allowed, and at the time, it was revolutionary. Back then we did all sorts of stuff to save CPU power ... like sampling a 33 RPM record at 45 RPM and then slowing it down at playback, just to save those extra few seconds of sample storage.
Your Mac Mini is already more powerful than my entire studio back then, but nonetheless, there\'s probably a lot you can do to \"Optimize\" your workflow.
It\'s really hard for me to comment on the deifferences between Pro Tools and Live, as I\'m a Logic guy. However, Pro Tools is generally recognized as a multitracking tool that\'s great for mixing, but lacks sequencing power.
I\'m pretty sure you can do everything in Ableton that you can in Pro Tools, and a whole lot more, actually. Once you get deeper into Ableton\'s time stretching and pitch shifting abilities, it can be quite powerfull, indeed.
It\'s all about experimenting to find what works for you!