I got stuck looking for some perf figures too. I realise they are going to vary widely by hardware, batch size, message size etc, but it would be really useful to have a comparison against, for example, a single RabbitMQ instance.
A message store is really not a comparable pattern to a message queue. It's unlikely that the usages would be similar enough to engender a meaningful comparison. They're not as dissimilar as an apples-to-oranges comparison, but maybe an apples-to-applesauce comparison.