The Quad will give you a lovely, controlled, clean and neutral sound.
The Cyrus will give you a little more boom and tizz with top and bottom emphasis.
The Quad is a pre/power that, in my opinion, wipes the 8vs2 off the kitchen floor.
The Cyrus will possibly be more impressive with a rock and pop track in the first 20 minutes. To be fair, some will prefer this excitement permanently.
The Quad has sublime midrange with it's class A, current dumping design.
The Cyrus can be upgraded with at least four other boxes.
The Quad doesn't need upgrading because it's complete.
The Spendor SA1, A5 or A6 will match beautifully with the Quad.
The Spendor SA1, A5 or A6 will match beautifully with the Cyrus.
Apologies for my very biased view but please give them a spin...