I have had good success with the Asus PG43UQ. (that is the XG438QR’s upgraded brother). Currently it is the same price as the other at 1,099$ If you want my full thoughts on the PG43UQ read my posts in this thread, as I go into too much detail to re-post here.
That monitor can be found at Amazon too, here is a B&H photo link because they currently are offering new units at the good price.
https://www.bhphotovideo.com/c/product/1559359-REG/asus_pg43uq_rog_swift_43_4k.html