TerraSin
MachineClawReason is one of the most stable DAW programs I have, largely due to the all in the program nature and not supporting 3rd party plugins.
By that logic, Sonar is equally as stable... provided you don't use plugins. 
wellllllll no not really. Sonar come with 3rd party stuff and some of the plugins had to be updated during various versions and crashed a lot. even some of the ProChannel had issues the ones included with X1 Pro, not talking about the extra paid ones.
Not trying to really start anything. Reason really is very stable with the included rack system and Propellerhead really do hammer out the bugs. but it's limited, and no VST support and as someone already pointed out track issues with midi and swapping out instruments.
I got Reason 7 for REX support and to be able to make my own REX samples for Stylus RMX. Plus I use it as a big large plugin through rewire sometimes.
Reason is quite capable as a DAW with some really good synths etc (Thor is awesome!). Reason is not going to make anyone quite using ProTools, Sonar or Cubrase.
BTW I own and use Reason 7, Cubase 7.5, ProTools 10/11, FL Studio 11/12 and of course Sonar X1, X2, X3 and now Splat.
I like Sonar the best but all my tool share a purpose and place in my toolbox. but $129 seems a bit steep for a lackluster update that v9 is for me and unless there is a sale or some bundle of rack REs or something I probably won't upgrade.