I used cubase on pc for years as soon as i went to mac and got logic my tracks and production seemed to get alot better. Thats just my personal view but i think its just a case of knowing you gear inside and out thats the real key i think. Logic just seems to work for me. It does take some learning though but when you've got the hang of it its great!! i wouldnt go back to cubase now i love logic its ace
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My virus TI works fine in logic usually i tune the synth with VC but when iv got a sound a like i switch to external instrument on logic and control the virus with midi and record the signal out the main outs. People say its no different but i like the sound of it and that way of working.
cheers Jamie