A Beginner's Question: 32 bit vs 8 Bit
Using a 32bit microcontroller vs a 8bit microcontroller is like using a Computer as a simple calculator, and using a smart phone as a simple calculator. One has more potential for expansion than the other, but simple things can be done on both.

Your first projects will be the typical blink an led or serial communication projects like everyone else. It doesn't matter if you are using an 8bit or 32bit microcontroller at that point. It will be the same, but with different names or settings. So if you want to use or plan on using a 32bit controller or if you have a plan for something big and complex, just go with the 32bit controller. I much rather a ferrari than a toyota, especially if they cost the same.