I wouldn't compare Max for Live with Reason too much. It might be at least as deep - even deeper in a way -, but it's not quite as accessible to the average user as Reason is, and it certainly doesn't integrate with Ableton in the same way as wires integrate with the Reason paradigm.
Personally, I was pretty shocked with Live 9's 'Max integration' which seems to be exactly as seperate from Ableton as it was in 8. It even still hangs when opening any Max device because it has to start up Max. That's not integration imo, that's ducttaping together everytime you need to use it.