I'm not using either, I have a coolworld 240 25mm with fillport in the back which I've connected to the back of the case so I'm not willing to change it
Besides, it's better than the Alphacool rad. I've had that before this one.
Now I'm going to use it in 3 slim fan mode, but would have preferred to use it with full size fans mainly for noise but also cooling capacity.
If the V1.2 would accommodate 50mm instead of 46 it would be possible.
With the 1.1 it's at 42mm or so? I don't see a reason to resize that bay to 46 because it will be to big for slim fans and to small for full sized fans.
Only a 20.5 rad would fit perfectly with full sized fans but not that many people actually use it in their builds, and a 25 is better. I think that will also be what most people use because the lt240 is that size.