Stayed at the Aladdin last time, staying at the MGM next month.
Aladdin - Better location, more central for the strip. This was what we really liked about it, and decided not to go for a hotel any further towards the Luxor (see reason below as to why we did). Rooms were great size, easy to get out onto the strip, nextdoor to Paris, Bellagio across the street, and Caesers just down from that. Room was always cleaned very well. Own shopping mall with things like Gap in it, meant if we just wanted to pop out for some shopping quickly it was easy, without having to trudge to Caesers and spend half an hour trying to navigate the place, and just as long trying to leave!! PF Changs restaurant as well. Only downside was possibly the pool. It was like 2 plain pools, and a couple of hot tubs. A bit concretey and old. Really surprised more people don't stay at the Aladdin because the price really was right and they seem quite competitive.
MGM - We are going when everything is well over $100 a night for the standard we want, managed to get it for $59 so even if we cab everywhere while we are there we still save. I also like NYNY opposite, quite a young persons hotel. Pool looks great. Considering we're going for 5 days on the strip, and 7 days off, when we stay on the strip, we hit the strip, so pool isn't the most important thing.