That question is entirely subjective. Take a look at the charts to see what interests you. I like the news mux on 91W as well as news feeds on 99W and 103W and various sports wildfeeds are found on a lot of them as well.
For an English speaker, PBS on 87W and 125W, CGTN News and CGTN Documentary on 95W and NHK on 103W.
For a French speaker, 34.5W and 97W with channels from France and various African countries. And CGTN Français on 95W is pretty good too.
For a Spanish speaker, 30W has a bunch of decent channels from Spain, Argentina, Uruguay and Peru.
Beside those, KBS World on 123W has some shows with English subtitles.
Bob I concur with many of the comments posted here, if you can see 125W lots of PBS channels there although that may be too far west from Quebec. I watch the NBC and NHK feeds on 103W, and the various News feeds.
I can't see east of 72W so can't comment on programming the other folks mentioned.