Generally speaking, we at LVA don’t focus on comparing luxury and high-end accommodations in Las Vegas. So this answer is based primarily on the hotel-within-a-hotel concept and a couple vital statistics about these places in Las Vegas-- their respective number of rooms and suites and starting room rates, though not comparative amenities, which one needs to judge for oneself by "paying and staying"; direct experience is always the best yardstick.
One thing we can say about amenities is this: The biggest advantage, to our mind, of "hidden" Las Vegas hotels-within-hotels is that almost all have special check-in, with their own entrances and lobbies or check-in privileges through the VIP welcome suites. Beyond that, it’s a matter of preferred location, price, and taste.
Hotel32, 50 lofts on the 32nd floor of Monte Carlo, is one of Las Vegas’ best-kept secrets. However, as you mention and we’ve written about recently, Hotel32 is slated to be renovated and rebranded as the NoMad Hotel as part of the Monte Carlo’s makeover into Park MGM. Many aficionados consider Hotel32 a bargain at $250 per night.
Beyond Hotel32, first up, as always, is the Mansion at MGM Grand, with 29 super-elite whale villas, but again, its inclusion here is due to its comparable size as a hotel-within-a-hotel; low-season rates for the smallest room here start at around $5,000 per night.
Similar to the Mansion at MGM Grand are the Palazzo Suites at the Rio, nine villas in a separate building. Also like the Mansion, if you have to ask how much they go for, you’re disqualified from staying there.
The Villas at the Mirage consist of 14 super-sized suites and lanais, among the most hidden of the hotels-within-hotels, starting at around $1,500.
If those are out of your price range, probably the most comparable hotel-within-a-hotel, size-wise, is the SkyLofts on the top two floors (they're all bi-level) of the MGM Grand, with 51 suites starting at around $700 per night.
Next would be Nobu. Though you list it as a "larger operation," it has only 181 suites, a drop in the Caesars 4,000-room bucket, with rates as low as $169 mid-week in November.
The Sky Suites at Aria comprise 310 suites; prices start at $500 for a one-bedroom penthouse with Strip view.
Let us know at which one you wind up and why.
