MO, no contest. And here's why from someone who once stayed nowhere BUT Wynncore properties:
Steve Wynn is courting a whole new slew of young money and with that comes the d'bag contingent and females who think it's okay to walk through a hotel drunk, loud and shoe-less. It's not. Frankly, it's tacky and no matter where you're staying at Wynncore, I'm seeing it now as the norm. A tower suite will not protect you from that.
MO is clubless, casinoless, smokeless and exudes a sense of calm and service that no other property on the strip can meet (sans places like MGM Mansion or any of the Wynncore villas). It appears that the d'bag contingent stay away from Mandarin because they know it's far above what they're wanting. Call me classist, but I'm fine with that. Ironically, it's the way Wynncore was before he started courting all of those idiotic nightclubs and beach spots.
Go with MO. Get a corner City Suite. You'll love it.
BN