Well, too me, they're both to my liking sound wise, but with different presentations so I don't think this would be a fair comparison, but I'm most definitely very happy with both of them sound wise. I've explained the sound I enjoy from the Utopia/Citadel pairing, so I'll explain the sound I enjoy from the Utopia/WA33 pairing. The WA33 takes the Utopia and totally transforms its sound pretty much beyond belief, at least too my ears. The WA33 adds such solidity, authority, thickness, richness and impact to the sound that it can be a mind blowing listening experience. Power definitely isn't everything, for sure, but sometimes if used responsibly it can be your friend.
I'm no reviewer (obviously) so this is the best I can do trying to explain what I'm hearing that draws me to both of these amplifiers, so I hope I was able to help you a little in answering your question. And keep in mind what I said in my last post;
"I can honestly say that I could easily live with this amp alone, it is that intriguing!" I meant this very much for the headphones I enjoy most, my listening volumes and all types of Jazz being my main Genre's. So fo me, the Citadel check all the boxes!