Did not want to hijack the earlier thread so I thought I would give my personal point by point comaprison of the two properties. I have become a fan of Aria and stayed there my last 6 or7 trips. First 2 in Corner Suites and last 4 or 5 in one bedroom SkySuite. (My wife insists it was 7 but I think 6) After reading so many positive reviews about Cosmo I wanted to really experience the property. My room at Cosmo was a One Bedroom Terrace.These rooms compare to an Aria Corner Suite in terms of price.It would not be fair to compare it to the SkySuites which are on a different level. I'm just going to go down point by point as I think of them and try to compare.This is based on my personal experience and I may miss some things but I'll do my best. 1.View...I've had some really nice views form Panoramic Corners at Aria but the view from my Cosmo room was the best I ever had. 39th floor East tower facing the fountains and North Strip. Cosmo wins 2.Restaurants...I've eaten at every restaurant in Aria except BarMasa.In Cosmo I've tried CommeCa,Stk,China Poblano,Milos,Overlook Grill,and Holsteins. Bottom line is both hotels have great restaurants and it is impossible to declare a winner. And if you stayed at one and wanted to eat at a restaurant in the other hotel it is a 5-10 min.walk. Tie 3.Bars and Lounges...If you don't count the bars in the restaurants,Cosmo has more options for casual cocktails.The Vesper Bar near the check in area is usually quiet.The Bond Bar right on the Strip is great for people watching. Quite a few other options. Aria has Bar Moderno,City Bar and View Bar.Close but.. Cosmo wins 4.Bed...Cosmo's bed was comfortable but on par with some of the other good strip hotels. The bed at Aria is the best!!No comparison. Aria wins 5.Room...This is the most interesting comparison as there are a lot of factors to consider. The terrace at Cosmo is nice although I did not use it as much as I thought I would.It was a benefit to open the sliding door. The room kind of had a weird setup.Not counting the flip open top on the ottoman,there was only one drawer in the entire room and that was under the sink in the living room.There are a couple open cubes in the closet but no dresser. The other thing that was strange is the angle of the couch in relation to the TV.It is on a 90 dgree angle and part of the couch is on the same wall as the TV. The bathroom is setup with a small vanity and single sink. The Corner Suites at Aria have very large bathrooms,double sinks,plus a full size tub. The tub in the Cosmo room was a small "plunge"tub at the window. The corner suites at Aria also have a powder room.Cosmo does not have this. It also seems the Corner Suites are in a more usable,maybe traditional,manner which I liked. Considering everything,it's kinda close but... Aria wins 6.Casino...The casino at Cosmo is cramped.They actually did a good job with the footprint they had to work with but the space is tight. The table games are squeezed together and last weekend's March Madness crowd made it a challenge. I walked up to Aria with several friends to cash basketball tickets and we were all struck by the open, almost cavernous feel walking into Aria. There are a couple positive things about the Cosmo casino.First,there are TVs everywhere so it was easy to keep track of the games.Apparently they run Cosmo commercials except when there are major sports on. The other positive I found was the dealers. I had read on other postings that they were very friendly.My experience confirmed this. Most of the dealers were personable,very friendly and engaging. Unfortunately for Cosmo,these 2 positives can't overcome the fact the Aria's casino is way more comfortable,less cramped,and better gambling. Aria wins 7.Players Clubs...There has been a lot of bad stuff written about both Identity at Cosmo and MLife. After one stay I can't really compare the two clubs.My room and food get comped at both places.I don'tplay slots so I don't rate collection of points. MLife has one benefit that I like which is a taxi line pass for Platinum. 8.Service/Housekeeping...This is a glaring contrast! Housekeeping has been pretty much flawless at Aria.Actually in the suites at Aria they do an evening turndown where they refresh all towels,washcloths,soap etc. At Cosmo my room did not get cleaned at all one day. The next day my room got cleaned but the maid left 2 bathtowels and nothing else.She threw them on the ottoman in the living room and they never made it to the bathroom. That afternoon I called and requested they bring up more towels plus hand towels.They said they would be right up. At 11pm they were still not there...I called....coming right up. At 8 am no towels yet,I called and they arrived 20 min later. There were a couple other small issues but as you can see. It's not even close... Aria wins. 9.Location...Although Aria is considered on the Strip it is located in the back part of City Center.It is a short walk to the Strip but it is a walk. I was in the East Tower at Cosmo which is closest to the Strip and the location was great.The Bond Bar actually is on the Strip. Cosmo wins. 10.Pools...Both properties have party pools which I did not use. The Aria pool complex is much nicer in that there are 3 large pools plus the party pool(Liquid) Cosmo did a nice job with their limited space but like the casino it is cramped. Aria wins Overall there were quite a few things I liked about Cosmo and I will stay there again. In a comparison however,the positives at Aria are way more important to me. The nicer room and casino are important.The bed at Aria is a bonus but the unreliable service and housekeeping is a dealbreaker for me. The powder room in the Corner Suites is also a plus.