Which hotel is better: Mandalay Bay, or MGM Grand?

Okay, so we're trying to decide which hotel to stay at when we go to las vegas this winter... which one is better? PLEASE give details and tips.Which hotel is better: Mandalay Bay, or MGM Grand?
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Has an unbias review of some sites from some Vegas local.
B oth are very good but MBay has the greatest pool and lazy river, an aquarium (Shark Reef).Which hotel is better: Mandalay Bay, or MGM Grand?
Mandalay Bay better pool, nicer rooms, not as crowded but location not as good

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MGM Grand best beds in Vegas great location, good pool, monorail station and brilliant fun

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Mandalay! (:
Both hotels are very fine but I would choose MGM because of the better location. Both have great room specials which you can find on http://www.vegas-hotels-online.com