I think voting manually will always be better even if it won't affect your curation returns. It's more personal and shows you've consumed the content and attempted to connect with other people which might get you a more genuine following.

There's only so much attention a person can put into other people's content in a day so I always tell people to use their votes wisely and try to also leave some engagement with them so they know it was manual!

Don't forget to participate in the next posh contest coming up soon!