ROGUE SP-5 OR MODWRIGHT LS-100

The 6SN7 based LS-100 based on my experience owning both it and the 12AU7 based BHK will be "warmer" sounding. The closest you will get to that with the Rogue will be with very expensive NOS Mullard tubes or some Matsushita's. So it depends on the "signature" of your Bryston and the type of sound you are trying to achieve. 

No not "bright" but 12AU7’s are just not as "warm" as 6SN7’s as a general rule but there are both types of both so pick the one you like and then adjust the tubes based on your budget. But based on just using the "stock" tubes provided the generalization will probably be true. I've owned gear from both companies and they both provide great customer service.