I never said you can't copy one Redrum pattern to another. I specifically said "With ReDrum, you can produce sequences with up to 64 steps—but that requires 'bank switching' among sets of 16 steps. Nor can you copy a sequence from one set of 16 steps to another."
A set of 16 steps that you want to copy to another set of 16 steps within a 64-step sequencer is not the same as copying a Pattern. If you know how to do what I'm talking about, then please tell me - I checked with Propellerheads before writing the article and they confirmed this is not possible with the current software.
The advantage of using Sonar's step sequencer is that there is no bank-switching, and you can have as many steps as you want. You also have a controller strip, and a variety of ways to manipulate rows that aren't available in Reason. This is no diss on Reason; I love the program. But a lot of people use Sonar and Reason together, and if you like working with step sequencers, using Sonar's is faster and easier for sequences longer than 16 steps.