Your call.
Paywise You’ll be on Z scale or what ever letter they are up to. At least EK is upfront and has been paying massive bonuses lately.
Hong Kong has mostly recovered from COVID and still has a lot going for it however most expats around 80 percent according to a recent report have fled the city. Replaced by mainland Chinese mostly. HK has High cost of housing with a reduced or no allowance. Cathay has a good network and I’m guessing you’ll have a similar experience with lifestyle at EK.
Check and Training and Industrial relations there can be very adversarial so be careful
climate is a big one too. Dubai is always Hot and hotter. Climate in HK is more temperate and tropical.
time to command, around 7 yrs at EK. Don’t know about CX.
your choice at the end of the day but if it was me I’d be going to EK hands down. CX is a shadow of its former self.