IK gets my vote personnaly , dark glass is exellent also but i do find that it need a lopt more tweaking usually
Testing as type the PA , like they amp sim , it lacks sometime the dynamic i have on IK , also the distortion is washed up , you know this modulation of sound to creat the growl , i have it great on IK , but on PA it's different , i need a real ampeg to compare lol ...
I was comapring and considering PA for fast moves during production , fireing amplitube and going threw things can be overkill sometime unless uyou made great starting points (witch i tend to do ) , in PA the SVT pro gets my vote .....