I think this is likely the best pho restaurant in Chinatown.
Funnily enough, I think EVERY pho place in Chinatown has at least one review in their window touting that they are one of the best pho restaurants in Chinatown, so it's hard to choose. However, I have to say that Xe Lua has never done me wrong. I always order the 101 Chef's Special Pho, broth is always piping hot, onions and beef are thinly sliced, and the noodles are always the Vietnamese version of al dente. Staff are what you would usually find at a pho restaurant - brisk and somewhat brusque but they get the job done. Not sure what you would expect otherwise for a $5 dinner!
Side note: don't ever go to 88. Shudder.