Botox and Juvederm do completely different things. Also, I combine the two quite frequently for the lips to do two different things.
Generally, the Juvederm fills the lips themselves, supports around the lips and can fill in the wrinkles and lines around the lips depending on how it’s used.
Botox relaxes over active muscles. It is used sometimes in tiny amounts around the lips to prevent or relax upper or lower lip lines.
So the answer to your question generally depends on your goals.
If you really want more fullness in your lips, then the Botox won’t do that. If you want a slightly different outline to your lips or the lips lines to be less obvious, then Botox would be a good choice.