Software Development New Workstation Brain Storming

Hi,

I will buy 2 new monitors. I will connect these 2 monitors with the daisy chain method.
Can you help with combinations that can be taken?
1- PC -> U2419HE -> P2419H
2- PC -> U2419HE -> U2419HE
3- PC -> P2421DC -> P2421DC
4- PC -> P2421DC -> P2419H
5- PC -> U2520D    -> U2419H
6- PC -> U2520D    -> P2419H
Which combination should I choose from the above?
Additionally I am curious about your choice of P2421DC and U2419HE.

Best regards