L-R: Lemonaid (applied heavily and lightly), You're Bluffing (applied heavily and lightly)
Lemonaid is a much more pale lemony yellow. You're Bluffing is what I'd call primary canary yellow. Lemonaid also has a much more solid texture, while You're Bluffing is not as tacky, and a bit more blendable due to it's smoother texture. Lastly, Lemonaid is more pigmented, partly because of it's tacky, thick texture, while You're Bluffing has less pigment.
Both have their uses. Lemonaid is probably better for people who wish for more coverage, and who don't mind working with the tacky texture of the concealer. On the other hand, if you prefer something easier to work with and don't need much coverage, You're Bluffing would do.