It's a process to transfer jurisdictions after being called so I agree that you should at least figure out what province you want to live in, and that's where you probably should do articling. That said, I have plenty of friends who articled here in Ontario and left the province when they were done (to go back to their home province or whatever). So it's not a hard and fast rule.
If you are truly torn (i.e., don't mind having to leave the province after you've articled), then take the job you think you'll like and is in an area of law that's connected with your interests. If you like criminal law, the good news is that it's federal so anywhere you go after you article will be able to make use of your experience. You may have to learn some local civ pro but that should not be difficult to figure out.
Also go to Queens and I also had many profs who did not allow computers in class (I am likely in the same section as the individual above). However, now that we are online we can do what we would like.
My advice, definitely do your reading notes on your computer. You'll waste too much time otherwise.
For class notes, it depends on the professor. Certain professors lecture more than others and in those classes you will have difficulty writing out all your notes by hand. However, other classes are more discussion based and do not require a lot of note taking.
However, as you said, trial and error is definitely required.