As an Australian with a family and 2 high-paying salaries paying a LOT of tax, none of those countries are remotely comparable to Australia.
If you hate taxes and fees, Singapore has a 60% Additional Buyer's Stamp Duty on residential property applied to foreign buyers, on top of an already insane property market. There's huge fines and government intervention into _everything_ and a massive high-stress culture.
Hong Kong is equally absurd for property and has a sword hanging over its head, that falls if China ever makes a move on Taiwan; the inevitable US and global sanctions would decimate HK.
Dubai is just a comical option.
I can get PR in Singapore through my partner, so no 60%. Company paid medical and everything so expat life and no responsibilities. And if I were ever have to have kids, you can’t hire a maid here sleeping at your apartment and you have to clean yourself which is ridiculous. In Hk, SG, Dubai you can get domestic helpers cheaply and they take care of everything