Ha. Really both.
1. With proper transformer design and PCB layout, there's no benefit in terms of hum and noise. And 2-box designs can actually be worse in this respect if stacked (see the link above.)
2. You want the regulation to be as close as possible to the circuit you're regulating, not in an external box. Of course, you can have an external box without regulation, and regulate locally.
but the biggest reason:
3. The chassis is usually the most costly part of a design. In some cases, it can exceed the cost of everything inside the box (usually not, in the case of our products, but when you go fancy, bring a big wallet.) So why double the chassis cost?
ah, never actually considered the chassis being such a big cost factor.
I see some companies, specifically motherboard manufacturers putting a copper wall around the audio circuitry to shield it from noise.
I always thought the 2 chassis stacks were a bit over the top, i.e. the Dark Star, which the Ragnarok has much more power and all in a single chassis, and can drive speakers!
Doesn't appear that your designs even need such silliness. Clean designs = happy listening, my bifrost hasn't disappointed me yet!
I really can't wait to hear the Yggdrasil! Guess i'll just invest in the Uber Analog upgrade until I can save up!