Re: yet another annoying cross training q
Listen to Ron, don't listen to Mark.
Judo will do you well, the randori will give you delivery system that will actually make your aikido effective. By contrast, from what I know of Danzan Ryu, the techniques will be similar yet different enough to potentially confuse the whole thing. In the hypothetical confrontation you may find yourself vacillating between which version of an outside wrist turn you are doing. With Judo it's clear, at this range I'm doing Aikido, at this range I'm doing judo.
But as you say the atmosphere and dojo culture should go a long way to your decision as well.