Reaktor is cool if your into expirimenting but if your looking for decent analog related sounds stay away,
The oscilators and filters sound very thin and plastic like which might be cool for digital sounds,soundscapes,fx and so but not if your looking to emulate a 70s beast :)

The Gmedia stuff are awesome, Oddity is one of my favorite synths and the minimonsta is my go-to synth for bass.

Arturia's moog modular is really out of this world, it sounds fantastic.

Effect Drenching
 

I tried zebra, and massive, and didnt think any of them come close to the tones of the Virus...
Zebra i actually thought was worse than massive, all the presets soooo
bloody drenched with effects, when you switched them all off, it was like
the bald girl just took off her wig...

Massive at can sound harshly digital, and I think Reaktor has a hoard of
synths that sound far better than it anyways...

best softsynth vst in my opinion, Korg MS20...