Motherboard ASRock X570 Phantom Gaming-ITX/TB3 ECC Ram

[Windfall]

Looking at building a workstation with the Ryzen 5 3600/3600X (not sure yet), and have noticed usability increases in my workload with ECC on my thinkpad p52.
I need 32GB of ram, and I've found these:

Supermicro 16 GB (1 x 16 GB) DDR4-2666 Memory

pcpartpicker.com

Crucial 16 GB (1 x 16 GB) DDR4-2666 Memory

pcpartpicker.com

Crucial 16 GB (1 x 16 GB) DDR4-2666 Memory

pcpartpicker.com

Samsung 16 GB (1 x 16 GB) DDR4-2133 Memory

pcpartpicker.com

The SuperMicro ram really interests me, due to it's height (or lack thereof).
The question is, which kit would be the best?

Because I'm incompetent, I don't understand CAS latency and timing, I really don't know.
(I would be running them in a set for 32GB, obviously.)

 

[FunkEngine]

So as I understand it ECC is officially unofficially supported by ASRock. I would definitely check the qvl for specific kits and use those because you may or may not find success with other kits. That said I don't see any 32GB ECC kits on the qvl highest I see a 16GB.