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Both are very nice and I mean very nice.
I went to Park Hyatt as an Explorist and got a nice upgrade.
Not a suite but very nice.
St Regis is in my opinion a little more elegant.
I stayed there on FHR but I only have Marriott gold status and the room wasn’t that special but I had a butler which I didn’t know what to do with.
Honestly don’t think either is a bad option.
Park Hyatt is a little closer to the nightlife of Nana Plaza and Soi Cowboy