Haven't used either one, but as for the bird bath product I always recommend just going with simple water. For the most part, it's all they really need. If there was ever some kind of issue, however, the only additive I'd ever mess with - short of advice from a CAV - is a bit of aloe.
I used them with my cockatiel, but I know ekkies are more sensitive. I was going to put a capful of the bathing solution in her spray bottle hoping it may smooth her molting.
I wouldn't bother! Like Plumsmum said they harbour germs and can get mouldy and to be honest for all the benefit you may aswell just let them use water, it's what they get in the wild. When moulting just let them bathe extra or even let them join you for a nice shower! A good steaming when covered in pin feathers must be heaven as it breaks down the casing on the new feathers, making them easier to remove and less itchy