It's basically just Abu Dhabi now, because they bailed out Dubai's housing sector on multiple occasion - in 2009 [0], 2019 [1], 2020 [2], and (down the grapevine) I've heard they might be providing an additional bailout to Dubai soon.
Furthermore, Saudi has started requiring companies that are operating in Saudi to operate a Saudi office, and won't give tenders to those who are managing the relationship remotely from Dubai now, so companies have started moving staff to Riyadh.
> Nevertheless, structurally different from the absolute monarchies around them
MbS is trying to remake KSA into an Abu Dhabi 2.0, as MbZ was his mentor
[0] - https://www.cnn.com/2009/BUSINESS/12/14/dubai.10.billion.bai...
[1] - https://www.reuters.com/article/idUSKCN1PU1LI/
[2] - https://www.reuters.com/article/idUSKBN22R23G/