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Cocentric System Studio is much more complicated thhan ModelSim .. ModelSim just gives you what u want exactly to the point .. for example, u can simply add a file to an existing project in modelsim , while in Cocentric most of the time u will need to creat a new model for the file u need to add ..
Effectively I do use both ModelSim and Cocentric, but I'm forced to use Cocentric and not very flexible dealing with it .. Maybe because am a ModelSim fan ..
To be honest, Cecentric gives u some more facilities like plotting the output of ur blocks .. similar to matlab .. for this , it can more suitable for system level design and verification .. while for modelsim, most of the people use it for RTL ..