How about none? 
Having used all of them, I can really vouch for the latter (below) in terms of “power”. If you are trying to have an abundance state, I find it is stronger than both combined, really. And a couple of others.
But if I had to choose, I’d probably go for the Gratitude and Abundance, since it’s more than just targeted for the mindset.
it really depends on whether you consider manifesting, to be in a state desireable to do so, or actual magic happening? Even though, the magic is just a consequence of the mindset 
https://forum.enlightenedstates.com/t/new-release-abundance-mindset/8746/6