The Audiolab sound quality, is probably better than the Bluesound, but the Powernode is rated at 80w per channel and being essentially class D, would be more efficient and cooler. I've not heard the Bluesound Powernode, but many think it's a leaner and more analytical sound, than the Audiolab topology. I think I would prefer this class D sound and it is a very tidy solution. If my Omnia does give up the ghost, under warranty, then I will be looking at the Powernode and DALIs. Also, as you mentioned, the 'mature' platform, does seem to have been released after lengthy testing and many people are delighted with the ease of use and functionality. I watched John Darko's video, with the Powernode and KEF sub and it did seem really flexible.
Have you considered the Roksan Atessa Streaming amp? It has BluOS built in and would easily beat the PowerNode for amplification, though obviously at a higher price.