top chapter houses

The best houses, location wise are the ones on 16th, the closer to the union the better so for sororities it's pretty much APhi, AOPi, Theta, Gamma Phi, and Pi Phi, for fraternities I would say Phi Psi, Delt, Sig Ep, and SAE.
Based on exterior, Kappa and APhi are really pretty, AXO is nice from the outside, and I think Gamma Phi and Theta look like the biggest. For frats, Beta is definitely the best, but Phi Psi is nice and Sig Ep isn't bad.
Interior is really anyone's guess, all the sororities are going to be fairly neat and most of the frats are a little too musty.
A house can be beautiful inside and out, but you have to be comfortable with the way it's set up. (Open air vs not)

Fraternities: As for location, it doesn't really matter, most fraternities are pretty close to the union besides houses like DU and maybe SAE. Beta, ATO, and FIJI are closest to downtown so going to restaurants or the bars is faster.

As far as aesthetic quality and the "niceness" of a house goes, Beta by far has the nicest house on campus. Some houses on the inside are really dirty, while others are taken care of better.

Sororities: Alpha Phi, Theta, AOPi, and Gamma Phi are very close to the union so they have a good location. Basically, every sorority on 16th street is a prime location due to being really close to the union.

For the looks of sorority houses, I would say that Kappa and A Phi have the best looking houses. Chi O looks kinda cool, and there are many other houses that are big. Typically, sororities on the inside are more well kept and clean than fraternities

Fraternities:
Location:
Teachers and engineers: Delt, Sigma Chi, and DU
Business: Fiji, Beta, Ato, Phi Delt
Union: Phi Psi, Sig Ep

Outside: Beta and Sigma Chi

Inside: Phi Delt has a movie theater
Beta just renovated their house last year
DU: Courtyard in the middle of the house