Rahool, on the principal that Xur doesn't hide what you're getting (save those ever exotic engrams), but may disappoint you on a weekly basis as he may not have the exotic you want (Hard Light) or has an exotic you absolutely wish he wouldn't sell (talk to a Warlock, they know what I'm on about). Rahool, on the other hand, is a crap shoot at best. At least he won't downgrade you anymore...