I've been using the Skratch Labs everyday hydration mix.
I like that it has no funky ingredients and a good balance of electrolytes. Flavor is very mild, certainly not bitter or metallic.
It kind of has more citric acid than I like during my long runs. It's fine on my stomach for before/after.
That it comes in bulk has plusses and minuses. It's good that it doesn't waste packaging, and that it can be mixed into a hydration bladder without having to release pressure as you would for an effervescent tablet. But then, it's harder to carry on the bike or in my travel carry-on, and because it doesn't have anti-caking agents, you have to be careful to store it COMPLETELY airtight (100% metal, glass or ceramic container with a good seal on the lid, no plastic lids).
I haven't tried Osmo.
"I felt [the women's Olympic marathon] was as important as women having the right to vote, because talent, strength, and capability cannot be fully realized if there are no personal rights to allow them to be visible or be deemed significant in the first place." - Kathrine Switzer, Marathon Woman