The difference between Inventor and Creo is that Creo is actively hostile towards the user; the UI is impossible to navigate, the rendering system is unstable, you have to edit a terrifying, completely undocumented text file called config.pro to get it to work properly, etc. However, under the hood, the tools do work. In the right hands, it can be an incredibly powerful tool, however, getting to a point where you can use it comfortably is absolute misery.
Inventor on the other hand, appears on the surface to be a competent piece of software. It's an Autodesk product, so the UI is sensible, things are where you think they would be, and on a surface level, it works well enough. However, the moment you ask it to do something even the slightest bit more complicated than "make a shape that is just a bunch of cubes smooshed together", it completely shits the bed in an unprecedented, unfathomably bizarre way, and some mechanical engineer who is older than god will reply to you on the forums with something like
yeah, that's a classic bug that was introduced in 2008. Autodesk released a software patch that was supposed to fix it in 2010, but instead the patch added another bug where extruding a hole on the origin to cause your part to collapse into 2-dimensions. This is now a critical part of Inventor workflow. You really should have known this, since it's covered in episode 147 of DanMan97's Inventor Tutorials, and it's expected that you watch all of those before posting here.
