well it may feel strange but with a friend who has a good set of speakers, we noticed some differences between samplitude and cubase... Samplitude sounded better, we didn't find if there was somewhere in the audio engine a difference, which would sound strange to me.
It was very very subtle though.
Anyway I tried samplitude, and found it to be the one that has the best ideas, the fact is just... For me it looks really bad, I couldn't get along with the way you edit in it, my workflow had dropped. But that was a 7 or 8 version.