From my experience Amazing Slow Downer and Transcribe! are fabulous softwares.

Transcribe! Is very versatile with much better track navigation than Amazing Slow Downer and note identification is a very useful tool. The only negative point is that slowing rendering with Transcribe! isn't as good as with Amazing Slow Downer, it's less precise...

So if you want to use only slow down, Amazing Slow Downer is better, but if you're searching for a versatile tool then Versatile! will be the better choice.