A lot of people seems to misunderstand that it is not really the aluminium material itself that hindering the LED performance, but the REAL CULPRIT is actually the dielectric layer that limiting the thermal transfer.
If we mount the LED on an aluminium MCPCB without the dielectric layer at all you can still obtain the comparable light output performance to your copper Sinkpad/Noctigon, even if the LED is driven very hard.
I know some people may argue that copper has much better thermal conductivity than aluminium - Yes it does, BUT in our LED flashlight application the heat produced by the overdriven LED is not even hitting the thermal conductivity bottleneck of the aluminium material.
You can read this comment from comfychair in the other thread. He was talking about the pill material but the idea is same.
Most importantly you should read djozz’s test HERE to get a good grasp of the idea. If you read the light output graph in this thread you will notice there is actually very little light output difference between the aluminium Sinkpad (w/o the stupid dielectric layer) and the copper Sinkpad, and that subtle light output difference can also be due to wear-&-tear of the LED from repetitive reflow process and high current operation.
As to answer OP, since the Courui D01 has very wide and flat reflector bottom I would suggest you to go for the 32mm Maxtoch copper MCPCB or the 32mm Noctigon MCPCB, as both of them have direct thermal path (a.k.a DTP). The stock 32mm board (having the annoying dielectric layer) is usable if you are not going to overdrive your LED (i.e. >3A for XM-L2) at all.