all the software is screwed in many ways. The trick is to find the ones where the defects dont limit the TYPE of work youre doing in the way that you want to work.
If you gotta edit a LOT, and move, cut, paste crossfade etc, fix timings, then Vegas shines as a SPEED DEMON
if you have a lot of outboard midi gear, and especially if you compose using regular sheet music, Logic is UNREAL, you can control youre midi setups in a somewhat logical way..be prepared for a steep learning curve tho.
If you do a lot of composing with midi, but also a lot of experimenting where you need to change things VERY quickly, cubase might be good.
Nuendo's belly is a LOT of very very well written audio code, efficient too! Its got a lot of potential but at the moment the user interface is made for midi sequencing, and just has audio kind of thrown in...expect 2.0 to be better ( I hope )
Sonar is another midi sequencerwith audio thrown in later, BUT it is also a platform which is pushing some new limits audiowise. DX8 plugin automation, DXi support, actually using WDM drivers for input monitoring...neat stuff also acid looping, all in one app
Pro Tools ( REAL PT ) will set you back some SERIOUS cash, but is very stable. You cant use dx or vst plugins with it tho, but it has its own TDM ones. Editing is about as fast as nuendo, but Logic Murders it midiwise
but all these apps are flawed. It seems like manufacturers DONT have to use this in the real world, with customers hanging over their shoulders. Input monitoring is still an issue??? Its hard on traditional clients who are used to tape style " auto-input" monitoring. But ASIO DM sort of solves this. Plug in delay is another painful topic
also with most apps using outboard gear during a mix is a tough one. Even with PT its sort of a voodoo ritual