[Tytus Gerrish]

Like with any program people will use what they are most skilled at. and companies will use what will fit their needs. I use autocad all day at work and am congenly refered to as the "MASTER MODELER" because i can model very quivkley and know lots of tricks to get the geometry and features you want for most given projects. as such i say autocad modeling is much quicker for me than inventor. however. with inventor once the parametric parameters are steup changes beciome easer.