Maxon Cinebench R15
We used the ‘CPU' test built into Cinebench R15. There is precious little difference between the three systems. The Asus has a slightly higher Turbo mode frequency for all four cores, but on a processor that is two generations behind the Dell and MSI. So the results are pretty much identical.
@James Morris, did Dell confirm support for eGPU enclosures through that Thunderbolt 3.0 port? Merely having the port isn’t enough, system BIOS level support is also needed for it work.