Re:New Dell XPS 13 developer edition now available
by fyfy18 on Wednesday January 23, 2019 @05:32PM
(#18983856)
Even well reviewed devices aren't guaranteed to work. At work I had a TB3 dock from Belkin, that was one of the top sellers on Amazon. Everything worked on the MBP, but when I tried connecting my ThinkPad (T470s) all the peripherals and displays worked, however it wouldn't deliver any power. On the other hand the cheap Chinese TB3 dock (UGREEN branded) I have at home works fine with the ThinkPad.
I'd either go with a hardware combination that you or a trusted reviewer has tested, or wait another year or so for the bugs to get worked out.
EDIT: Or just avoid Dell, they seem to be behind the curve on figuring out Thunderbolt 3.