To get the ball rolling, here is my rationale ...
Uniqlo: Their price to quality ratio is hard to beat. Every time I visit the NYC flagship store, I end up walking out with a good-looking basic I wear all the time.
Rugby: This was tough. I feel Rugby could top this list. Their fit and quality is head & shoulders above anyone else here. But alas everything is way too expensive (even on sale).
J.Crew: This company is firing on all cylinders these days. Great looking clothes, but a tad expensive. Sales can be good. Quality is below the two companies listed above.
H&M: Quality is garbage but the prices are so low it evens out. They cut their clothes slimmer than anyone else, which is a big plus.
BR: Most of their clothes are boring, working stiff items that scream "I'm a consultant!" Basically it's J.Crew without style or vision.
A&F: Ah, a huge upset! Everyone hates A&F here, but their quality is undeniable. Shirts and sweaters are thick and will last forever. Muscle fit shirts are quite flattering too. Unfortunately their retail prices are too high, bro.
Gap: A poor man's Uniqlo. I feel their styles always lag behind their quality.
Target: Mediocre basics at unbeatable prices. For standards like workout gear and tube socks, this is your company. I feel Target could rate higher on this list, maybe between H&M and J.Crew but too often items feel cheap.
American Eagle: What is this company doing here, you ask? Don't they suck? No, actually, they don't suck. If you know what to get, this place is great for basics.
Old Navy: Shoddy quality, but the price is often right.
Express: Now we're hitting the dregs. I don't get this store. It charges BR prices for stuff you can only wear to your high school prom. It's too bad because they carry lots of slim fits.
Aeropostale: I'm probably not Aero's target audience because I'm not 14 years old, but everything in this store looks pretty lame. I suspect they employ 40% of all sweatshops in Asia.
Club Monaco: I really don't understand this place. Someone might have to explain it to me. Prices are outrageous and everything is "minimalist" crap.