Im a a little confused about the korean/pho together. Vietnamese food and Korean food are VERY different and if there is a place that is serving both, thats a good warning that you shouldn't trust at least half of the menu there.
There are two very different types of pho, northern and southern. Pho is originally from Hanoi, and the northern version is simpler and has milder flavors than the souther one. The typical HCM city pho, comes with the herb garnishes and bean sprouts on the side. They actually taste very different and you will probably only get a good version of the southern one in the U.S.
That said, my favorite place to get pho in chicago is not on Argyle, its in Lincoln Park instead. Simply It, right next to children's memorial hospital. The owner is really nice and friendly which is a plus and the inside a lot cleaner than most other vietnamese places.
If you watched Anthony Bourdain eat pho in vietnam, again the pho you get there tastes completely different than any you would get in chicago. For banh mi on the other hand, I prefer the americanized ones better than the ones you can get in the streets of Vietnam.